diff --git a/compiler/fir/fir2ir/tests/org/jetbrains/kotlin/fir/Fir2IrTextTestGenerated.java b/compiler/fir/fir2ir/tests/org/jetbrains/kotlin/fir/Fir2IrTextTestGenerated.java
index f2d1b03897d..af47c3f93a7 100644
--- a/compiler/fir/fir2ir/tests/org/jetbrains/kotlin/fir/Fir2IrTextTestGenerated.java
+++ b/compiler/fir/fir2ir/tests/org/jetbrains/kotlin/fir/Fir2IrTextTestGenerated.java
@@ -1595,6 +1595,11 @@ public class Fir2IrTextTestGenerated extends AbstractFir2IrTextTest {
                 runTest("compiler/testData/ir/irText/expressions/funInterface/samConversionInVarargs.kt");
             }
 
+            @TestMetadata("samConversionInVarargsMixed.kt")
+            public void testSamConversionInVarargsMixed() throws Exception {
+                runTest("compiler/testData/ir/irText/expressions/funInterface/samConversionInVarargsMixed.kt");
+            }
+
             @TestMetadata("samConversionOnCallableReference.kt")
             public void testSamConversionOnCallableReference() throws Exception {
                 runTest("compiler/testData/ir/irText/expressions/funInterface/samConversionOnCallableReference.kt");
diff --git a/compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/ArgumentsGenerationUtils.kt b/compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/ArgumentsGenerationUtils.kt
index 46441cef330..5a88e8f3cd3 100644
--- a/compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/ArgumentsGenerationUtils.kt
+++ b/compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/ArgumentsGenerationUtils.kt
@@ -23,7 +23,10 @@ import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.descriptors.impl.SyntheticFieldDescriptor
 import org.jetbrains.kotlin.descriptors.impl.TypeAliasConstructorDescriptor
 import org.jetbrains.kotlin.incremental.components.NoLookupLocation
-import org.jetbrains.kotlin.ir.builders.*
+import org.jetbrains.kotlin.ir.builders.irBlock
+import org.jetbrains.kotlin.ir.builders.irBlockBody
+import org.jetbrains.kotlin.ir.builders.irGet
+import org.jetbrains.kotlin.ir.builders.irTemporary
 import org.jetbrains.kotlin.ir.declarations.IrDeclarationOrigin
 import org.jetbrains.kotlin.ir.declarations.IrSimpleFunction
 import org.jetbrains.kotlin.ir.declarations.impl.IrFunctionImpl
@@ -619,10 +622,11 @@ fun StatementGenerator.generateSamConversionForValueArgumentsIfRequired(call: Ca
     for (i in underlyingValueParameters.indices) {
         val underlyingValueParameter = underlyingValueParameters[i]
 
+        val expectedSamConversionTypesForVararg = ArrayList<KotlinType?>()
         if (expectSamConvertedArgumentToBeAvailableInResolvedCall && resolvedCall is NewResolvedCallImpl<*>) {
-            // TODO support SAM conversion of varargs
-            val argument = resolvedCall.valueArguments[originalValueParameters[i]]?.arguments?.singleOrNull() ?: continue
-            resolvedCall.getExpectedTypeForSamConvertedArgument(argument) ?: continue
+            val arguments = resolvedCall.valueArguments[originalValueParameters[i]]?.arguments ?: continue
+            arguments.mapTo(expectedSamConversionTypesForVararg) { resolvedCall.getExpectedTypeForSamConvertedArgument(it) }
+            if (expectedSamConversionTypesForVararg.all { it == null }) continue
         } else {
             // When the method is `f(T)` with `T` = a SAM type, the substituted type is a SAM while the original is not;
             // when the method is `f(X<T>)` with `T` = `out V` where `X` is a SAM type, the substituted type is `Nothing`
@@ -678,11 +682,16 @@ fun StatementGenerator.generateSamConversionForValueArgumentsIfRequired(call: Ca
                     substitutedVarargType.toIrType(),
                     irSamType
                 ).apply {
-                    originalArgument.elements.mapTo(elements) {
-                        if (it is IrExpression)
-                            samConvertScalarExpression(it)
-                        else
+                    originalArgument.elements.mapIndexedTo(elements) { index, element ->
+                        if (element is IrExpression) {
+                            val samType = expectedSamConversionTypesForVararg[index]
+                            if (samType != null)
+                                samConvertScalarExpression(element)
+                            else
+                                element
+                        } else {
                             throw AssertionError("Unsupported: spread vararg element with SAM conversion")
+                        }
                     }
                 }
             }
diff --git a/compiler/testData/codegen/box/funInterface/funConversionInVararg.kt b/compiler/testData/codegen/box/funInterface/funConversionInVararg.kt
index c27161ecda4..5741ce3e58b 100644
--- a/compiler/testData/codegen/box/funInterface/funConversionInVararg.kt
+++ b/compiler/testData/codegen/box/funInterface/funConversionInVararg.kt
@@ -1,4 +1,6 @@
 // !LANGUAGE: +NewInference +FunctionalInterfaceConversion +SamConversionPerArgument
+// IGNORE_BACKEND_FIR: JVM_IR
+
 fun interface MyRunnable {
     fun run()
 }
diff --git a/compiler/testData/codegen/box/sam/kt31908.kt b/compiler/testData/codegen/box/sam/kt31908.kt
index 3d7df05a9b4..ae6700d1e89 100644
--- a/compiler/testData/codegen/box/sam/kt31908.kt
+++ b/compiler/testData/codegen/box/sam/kt31908.kt
@@ -1,4 +1,5 @@
 // TARGET_BACKEND: JVM
+// IGNORE_BACKEND_FIR: JVM_IR
 // FILE: kt31908.kt
 fun box(): String {
     var result = "failed"
diff --git a/compiler/testData/ir/irText/expressions/funInterface/samConversionInVarargs.txt b/compiler/testData/ir/irText/expressions/funInterface/samConversionInVarargs.txt
index 34a2eb0fff8..df7093b1723 100644
--- a/compiler/testData/ir/irText/expressions/funInterface/samConversionInVarargs.txt
+++ b/compiler/testData/ir/irText/expressions/funInterface/samConversionInVarargs.txt
@@ -35,21 +35,21 @@ FILE fqName:<root> fileName:/samConversionInVarargs.kt
     BLOCK_BODY
       CALL 'public final fun useVararg (vararg foos: <root>.IFoo): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
         foos: VARARG type=kotlin.Array<out <root>.IFoo> varargElementType=<root>.IFoo
-          TYPE_OP type=<root>.IFoo origin=IMPLICIT_CAST typeOperand=<root>.IFoo
+          TYPE_OP type=<root>.IFoo origin=SAM_CONVERSION typeOperand=<root>.IFoo
             FUN_EXPR type=kotlin.Function1<@[ParameterName(name = 'i')] kotlin.Int, kotlin.Unit> origin=LAMBDA
               FUN LOCAL_FUNCTION_FOR_LAMBDA name:<anonymous> visibility:local modality:FINAL <> (it:kotlin.Int) returnType:kotlin.Unit
                 VALUE_PARAMETER name:it index:0 type:kotlin.Int
                 BLOCK_BODY
                   RETURN type=kotlin.Nothing from='local final fun <anonymous> (it: kotlin.Int): kotlin.Unit declared in <root>.testSeveralLambdas'
                     GET_OBJECT 'CLASS IR_EXTERNAL_DECLARATION_STUB OBJECT name:Unit modality:FINAL visibility:public superTypes:[kotlin.Any]' type=kotlin.Unit
-          TYPE_OP type=<root>.IFoo origin=IMPLICIT_CAST typeOperand=<root>.IFoo
+          TYPE_OP type=<root>.IFoo origin=SAM_CONVERSION typeOperand=<root>.IFoo
             FUN_EXPR type=kotlin.Function1<@[ParameterName(name = 'i')] kotlin.Int, kotlin.Unit> origin=LAMBDA
               FUN LOCAL_FUNCTION_FOR_LAMBDA name:<anonymous> visibility:local modality:FINAL <> (it:kotlin.Int) returnType:kotlin.Unit
                 VALUE_PARAMETER name:it index:0 type:kotlin.Int
                 BLOCK_BODY
                   RETURN type=kotlin.Nothing from='local final fun <anonymous> (it: kotlin.Int): kotlin.Unit declared in <root>.testSeveralLambdas'
                     GET_OBJECT 'CLASS IR_EXTERNAL_DECLARATION_STUB OBJECT name:Unit modality:FINAL visibility:public superTypes:[kotlin.Any]' type=kotlin.Unit
-          TYPE_OP type=<root>.IFoo origin=IMPLICIT_CAST typeOperand=<root>.IFoo
+          TYPE_OP type=<root>.IFoo origin=SAM_CONVERSION typeOperand=<root>.IFoo
             FUN_EXPR type=kotlin.Function1<@[ParameterName(name = 'i')] kotlin.Int, kotlin.Unit> origin=LAMBDA
               FUN LOCAL_FUNCTION_FOR_LAMBDA name:<anonymous> visibility:local modality:FINAL <> (it:kotlin.Int) returnType:kotlin.Unit
                 VALUE_PARAMETER name:it index:0 type:kotlin.Int
diff --git a/compiler/testData/ir/irText/expressions/funInterface/samConversionInVarargsMixed.fir.txt b/compiler/testData/ir/irText/expressions/funInterface/samConversionInVarargsMixed.fir.txt
new file mode 100644
index 00000000000..6e37891949c
--- /dev/null
+++ b/compiler/testData/ir/irText/expressions/funInterface/samConversionInVarargsMixed.fir.txt
@@ -0,0 +1,39 @@
+FILE fqName:<root> fileName:/samConversionInVarargsMixed.kt
+  CLASS INTERFACE name:MyRunnable modality:ABSTRACT visibility:public superTypes:[kotlin.Any]
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.MyRunnable
+    FUN name:run visibility:public modality:ABSTRACT <> ($this:<root>.MyRunnable) returnType:kotlin.Unit
+      $this: VALUE_PARAMETER name:<this> type:<root>.MyRunnable
+    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
+      overridden:
+        public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
+    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+      overridden:
+        public open fun hashCode (): kotlin.Int declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+      overridden:
+        public open fun toString (): kotlin.String declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+  FUN name:test visibility:public modality:FINAL <> (a:kotlin.Any, r:<root>.MyRunnable) returnType:kotlin.Unit
+    VALUE_PARAMETER name:a index:0 type:kotlin.Any
+    VALUE_PARAMETER name:r index:1 type:<root>.MyRunnable
+    BLOCK_BODY
+      WHEN type=kotlin.Unit origin=IF
+        BRANCH
+          if: TYPE_OP type=kotlin.Boolean origin=INSTANCEOF typeOperand=<root>.MyRunnable
+            GET_VAR 'a: kotlin.Any declared in <root>.test' type=kotlin.Any origin=null
+          then: CALL 'public final fun foo (vararg rs: <root>.MyRunnable): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
+            rs: VARARG type=kotlin.Array<out <root>.MyRunnable> varargElementType=<root>.MyRunnable
+              FUN_EXPR type=kotlin.Function0<kotlin.Unit> origin=LAMBDA
+                FUN LOCAL_FUNCTION_FOR_LAMBDA name:<anonymous> visibility:local modality:FINAL <> () returnType:kotlin.Unit
+                  BLOCK_BODY
+                    RETURN type=kotlin.Nothing from='local final fun <anonymous> (): kotlin.Unit declared in <root>.test'
+                      GET_OBJECT 'CLASS IR_EXTERNAL_DECLARATION_STUB OBJECT name:Unit modality:FINAL visibility:public superTypes:[kotlin.Any]' type=kotlin.Unit
+              GET_VAR 'r: <root>.MyRunnable declared in <root>.test' type=<root>.MyRunnable origin=null
+              TYPE_OP type=<root>.MyRunnable origin=IMPLICIT_CAST typeOperand=<root>.MyRunnable
+                GET_VAR 'a: kotlin.Any declared in <root>.test' type=kotlin.Any origin=null
+  FUN name:foo visibility:public modality:FINAL <> (rs:kotlin.Array<out <root>.MyRunnable>) returnType:kotlin.Unit
+    VALUE_PARAMETER name:rs index:0 type:kotlin.Array<out <root>.MyRunnable> varargElementType:<root>.MyRunnable [vararg]
+    BLOCK_BODY
diff --git a/compiler/testData/ir/irText/expressions/funInterface/samConversionInVarargsMixed.kt b/compiler/testData/ir/irText/expressions/funInterface/samConversionInVarargsMixed.kt
new file mode 100644
index 00000000000..bbaeb03038c
--- /dev/null
+++ b/compiler/testData/ir/irText/expressions/funInterface/samConversionInVarargsMixed.kt
@@ -0,0 +1,12 @@
+// !LANGUAGE: +NewInference +FunctionalInterfaceConversion +SamConversionPerArgument
+fun interface MyRunnable {
+    fun run()
+}
+
+fun test(a: Any, r: MyRunnable) {
+    if (a is MyRunnable) {
+        foo({}, r, a)
+    }
+}
+
+fun foo(vararg rs: MyRunnable) {}
diff --git a/compiler/testData/ir/irText/expressions/funInterface/samConversionInVarargsMixed.txt b/compiler/testData/ir/irText/expressions/funInterface/samConversionInVarargsMixed.txt
new file mode 100644
index 00000000000..7fef096d089
--- /dev/null
+++ b/compiler/testData/ir/irText/expressions/funInterface/samConversionInVarargsMixed.txt
@@ -0,0 +1,41 @@
+FILE fqName:<root> fileName:/samConversionInVarargsMixed.kt
+  CLASS INTERFACE name:MyRunnable modality:ABSTRACT visibility:public [fun] superTypes:[kotlin.Any]
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.MyRunnable
+    FUN name:run visibility:public modality:ABSTRACT <> ($this:<root>.MyRunnable) returnType:kotlin.Unit
+      $this: VALUE_PARAMETER name:<this> type:<root>.MyRunnable
+    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
+      overridden:
+        public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
+    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+      overridden:
+        public open fun hashCode (): kotlin.Int declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+      overridden:
+        public open fun toString (): kotlin.String declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+  FUN name:test visibility:public modality:FINAL <> (a:kotlin.Any, r:<root>.MyRunnable) returnType:kotlin.Unit
+    VALUE_PARAMETER name:a index:0 type:kotlin.Any
+    VALUE_PARAMETER name:r index:1 type:<root>.MyRunnable
+    BLOCK_BODY
+      WHEN type=kotlin.Unit origin=IF
+        BRANCH
+          if: TYPE_OP type=kotlin.Boolean origin=INSTANCEOF typeOperand=<root>.MyRunnable
+            GET_VAR 'a: kotlin.Any declared in <root>.test' type=kotlin.Any origin=null
+          then: BLOCK type=kotlin.Unit origin=null
+            CALL 'public final fun foo (vararg rs: <root>.MyRunnable): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
+              rs: VARARG type=kotlin.Array<out <root>.MyRunnable> varargElementType=<root>.MyRunnable
+                TYPE_OP type=<root>.MyRunnable origin=SAM_CONVERSION typeOperand=<root>.MyRunnable
+                  FUN_EXPR type=kotlin.Function0<kotlin.Unit> origin=LAMBDA
+                    FUN LOCAL_FUNCTION_FOR_LAMBDA name:<anonymous> visibility:local modality:FINAL <> () returnType:kotlin.Unit
+                      BLOCK_BODY
+                        RETURN type=kotlin.Nothing from='local final fun <anonymous> (): kotlin.Unit declared in <root>.test'
+                          GET_OBJECT 'CLASS IR_EXTERNAL_DECLARATION_STUB OBJECT name:Unit modality:FINAL visibility:public superTypes:[kotlin.Any]' type=kotlin.Unit
+                GET_VAR 'r: <root>.MyRunnable declared in <root>.test' type=<root>.MyRunnable origin=null
+                TYPE_OP type=<root>.MyRunnable origin=IMPLICIT_CAST typeOperand=<root>.MyRunnable
+                  GET_VAR 'a: kotlin.Any declared in <root>.test' type=kotlin.Any origin=null
+  FUN name:foo visibility:public modality:FINAL <> (rs:kotlin.Array<out <root>.MyRunnable>) returnType:kotlin.Unit
+    VALUE_PARAMETER name:rs index:0 type:kotlin.Array<out <root>.MyRunnable> varargElementType:<root>.MyRunnable [vararg]
+    BLOCK_BODY
diff --git a/compiler/tests/org/jetbrains/kotlin/ir/IrTextTestCaseGenerated.java b/compiler/tests/org/jetbrains/kotlin/ir/IrTextTestCaseGenerated.java
index ee268f7f7e5..aa456a0f6fc 100644
--- a/compiler/tests/org/jetbrains/kotlin/ir/IrTextTestCaseGenerated.java
+++ b/compiler/tests/org/jetbrains/kotlin/ir/IrTextTestCaseGenerated.java
@@ -1594,6 +1594,11 @@ public class IrTextTestCaseGenerated extends AbstractIrTextTestCase {
                 runTest("compiler/testData/ir/irText/expressions/funInterface/samConversionInVarargs.kt");
             }
 
+            @TestMetadata("samConversionInVarargsMixed.kt")
+            public void testSamConversionInVarargsMixed() throws Exception {
+                runTest("compiler/testData/ir/irText/expressions/funInterface/samConversionInVarargsMixed.kt");
+            }
+
             @TestMetadata("samConversionOnCallableReference.kt")
             public void testSamConversionOnCallableReference() throws Exception {
                 runTest("compiler/testData/ir/irText/expressions/funInterface/samConversionOnCallableReference.kt");