diff --git a/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDataClassConverters.kt b/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDataClassConverters.kt
index 16d2aecd66c..0348aea8411 100644
--- a/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDataClassConverters.kt
+++ b/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDataClassConverters.kt
@@ -3779,6 +3779,12 @@ internal val KT_DIAGNOSTIC_CONVERTER = KtDiagnosticConverterBuilder.buildConvert
             token,
         )
     }
+    add(FirErrors.DYNAMIC_NOT_ALLOWED) { firDiagnostic ->
+        DynamicNotAllowedImpl(
+            firDiagnostic as KtPsiDiagnostic,
+            token,
+        )
+    }
     add(FirErrors.ENUM_ENTRY_AS_TYPE) { firDiagnostic ->
         EnumEntryAsTypeImpl(
             firDiagnostic as KtPsiDiagnostic,
diff --git a/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDiagnostics.kt b/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDiagnostics.kt
index 4942c532820..7272b5891c9 100644
--- a/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDiagnostics.kt
+++ b/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDiagnostics.kt
@@ -2641,6 +2641,10 @@ sealed interface KtFirDiagnostic<PSI : PsiElement> : KtDiagnosticWithPsi<PSI> {
         override val diagnosticClass get() = IsEnumEntry::class
     }
 
+    interface DynamicNotAllowed : KtFirDiagnostic<KtTypeReference> {
+        override val diagnosticClass get() = DynamicNotAllowed::class
+    }
+
     interface EnumEntryAsType : KtFirDiagnostic<KtTypeReference> {
         override val diagnosticClass get() = EnumEntryAsType::class
     }
diff --git a/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDiagnosticsImpl.kt b/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDiagnosticsImpl.kt
index 3988386ff2b..d55f3f96ad7 100644
--- a/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDiagnosticsImpl.kt
+++ b/analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDiagnosticsImpl.kt
@@ -3183,6 +3183,11 @@ internal class IsEnumEntryImpl(
     token: KtLifetimeToken,
 ) : KtAbstractFirDiagnostic<KtTypeReference>(firDiagnostic, token), KtFirDiagnostic.IsEnumEntry
 
+internal class DynamicNotAllowedImpl(
+    firDiagnostic: KtPsiDiagnostic,
+    token: KtLifetimeToken,
+) : KtAbstractFirDiagnostic<KtTypeReference>(firDiagnostic, token), KtFirDiagnostic.DynamicNotAllowed
+
 internal class EnumEntryAsTypeImpl(
     firDiagnostic: KtPsiDiagnostic,
     token: KtLifetimeToken,
diff --git a/compiler/fir/checkers/checkers-component-generator/src/org/jetbrains/kotlin/fir/checkers/generator/diagnostics/FirDiagnosticsList.kt b/compiler/fir/checkers/checkers-component-generator/src/org/jetbrains/kotlin/fir/checkers/generator/diagnostics/FirDiagnosticsList.kt
index 369424f7506..87dfe446097 100644
--- a/compiler/fir/checkers/checkers-component-generator/src/org/jetbrains/kotlin/fir/checkers/generator/diagnostics/FirDiagnosticsList.kt
+++ b/compiler/fir/checkers/checkers-component-generator/src/org/jetbrains/kotlin/fir/checkers/generator/diagnostics/FirDiagnosticsList.kt
@@ -1307,6 +1307,7 @@ object DIAGNOSTICS_LIST : DiagnosticList("FirErrors") {
             parameter<Boolean>("compileTimeCheckResult")
         }
         val IS_ENUM_ENTRY by error<KtTypeReference>()
+        val DYNAMIC_NOT_ALLOWED by error<KtTypeReference>()
         val ENUM_ENTRY_AS_TYPE by error<KtTypeReference>(PositioningStrategy.SELECTOR_BY_QUALIFIED)
     }
 
diff --git a/compiler/fir/checkers/gen/org/jetbrains/kotlin/fir/analysis/diagnostics/FirErrors.kt b/compiler/fir/checkers/gen/org/jetbrains/kotlin/fir/analysis/diagnostics/FirErrors.kt
index 05fcf0420f4..d36da80b326 100644
--- a/compiler/fir/checkers/gen/org/jetbrains/kotlin/fir/analysis/diagnostics/FirErrors.kt
+++ b/compiler/fir/checkers/gen/org/jetbrains/kotlin/fir/analysis/diagnostics/FirErrors.kt
@@ -678,6 +678,7 @@ object FirErrors {
     val UNCHECKED_CAST by warning2<KtBinaryExpressionWithTypeRHS, ConeKotlinType, ConeKotlinType>(SourceElementPositioningStrategies.AS_TYPE)
     val USELESS_IS_CHECK by warning1<KtElement, Boolean>()
     val IS_ENUM_ENTRY by error0<KtTypeReference>()
+    val DYNAMIC_NOT_ALLOWED by error0<KtTypeReference>()
     val ENUM_ENTRY_AS_TYPE by error0<KtTypeReference>(SourceElementPositioningStrategies.SELECTOR_BY_QUALIFIED)
 
     // When expressions
diff --git a/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/expression/FirCastOperatorsChecker.kt b/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/expression/FirCastOperatorsChecker.kt
index d23f91d0d92..61d8e7908b3 100644
--- a/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/expression/FirCastOperatorsChecker.kt
+++ b/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/expression/FirCastOperatorsChecker.kt
@@ -17,6 +17,7 @@ import org.jetbrains.kotlin.fir.expressions.FirOperation
 import org.jetbrains.kotlin.fir.expressions.FirTypeOperatorCall
 import org.jetbrains.kotlin.fir.expressions.unwrapSmartcastExpression
 import org.jetbrains.kotlin.fir.resolve.fullyExpandedType
+import org.jetbrains.kotlin.fir.types.ConeDynamicType
 import org.jetbrains.kotlin.fir.types.coneType
 
 object FirCastOperatorsChecker : FirTypeOperatorCallChecker() {
@@ -29,22 +30,33 @@ object FirCastOperatorsChecker : FirTypeOperatorCallChecker() {
 
         val isSafeAs = expression.operation == FirOperation.SAFE_AS
         if (expression.operation == FirOperation.AS || isSafeAs) {
-            val castType = checkCasting(actualType, targetType, isSafeAs, context)
-            if (castType == CastingType.Impossible) {
-                if (context.languageVersionSettings.supportsFeature(LanguageFeature.EnableDfaWarningsInK2)) {
-                    reporter.reportOn(expression.source, FirErrors.CAST_NEVER_SUCCEEDS, context)
+            if (targetType is ConeDynamicType) {
+                reporter.reportOn(conversionTypeRef.source, FirErrors.DYNAMIC_NOT_ALLOWED, context)
+            } else {
+                val castType = checkCasting(actualType, targetType, isSafeAs, context)
+                if (castType == CastingType.Impossible) {
+                    if (context.languageVersionSettings.supportsFeature(LanguageFeature.EnableDfaWarningsInK2)) {
+                        reporter.reportOn(expression.source, FirErrors.CAST_NEVER_SUCCEEDS, context)
+                    }
+                } else if (castType == CastingType.Always) {
+                    if (context.languageVersionSettings.supportsFeature(LanguageFeature.EnableDfaWarningsInK2)) {
+                        reporter.reportOn(expression.source, FirErrors.USELESS_CAST, context)
+                    }
+                } else if (isCastErased(actualType, targetType, context)) {
+                    reporter.reportOn(expression.source, FirErrors.UNCHECKED_CAST, actualType, targetType, context)
                 }
-            } else if (castType == CastingType.Always) {
-                if (context.languageVersionSettings.supportsFeature(LanguageFeature.EnableDfaWarningsInK2)) {
-                    reporter.reportOn(expression.source, FirErrors.USELESS_CAST, context)
-                }
-            } else if (isCastErased(actualType, targetType, context)) {
-                reporter.reportOn(expression.source, FirErrors.UNCHECKED_CAST, actualType, targetType, context)
             }
         } else if (expression.operation == FirOperation.IS) {
+            if (targetType is ConeDynamicType) {
+                reporter.reportOn(conversionTypeRef.source, FirErrors.DYNAMIC_NOT_ALLOWED, context)
+            }
             if (!context.isContractBody && isCastErased(actualType, targetType, context)) {
                 reporter.reportOn(conversionTypeRef.source, FirErrors.CANNOT_CHECK_FOR_ERASED, targetType, context)
             }
+        } else if (expression.operation == FirOperation.NOT_IS) {
+            if (targetType is ConeDynamicType) {
+                reporter.reportOn(conversionTypeRef.source, FirErrors.DYNAMIC_NOT_ALLOWED, context)
+            }
         }
     }
 }
diff --git a/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/diagnostics/FirErrorsDefaultMessages.kt b/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/diagnostics/FirErrorsDefaultMessages.kt
index 5eeb4e5cfce..72b0a527695 100644
--- a/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/diagnostics/FirErrorsDefaultMessages.kt
+++ b/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/diagnostics/FirErrorsDefaultMessages.kt
@@ -229,6 +229,7 @@ import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.FLOAT_LITERAL_OUT
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.DEPRECATED_BINARY_MOD
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.EXPOSED_PROPERTY_TYPE_IN_CONSTRUCTOR
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.DEPRECATED_IDENTITY_EQUALS
+import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.DYNAMIC_NOT_ALLOWED
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.EXPECTED_EXTERNAL_DECLARATION
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.EXPECTED_TAILREC_FUNCTION
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.EXPECT_ACTUAL_OPT_IN_ANNOTATION
@@ -1966,6 +1967,7 @@ object FirErrorsDefaultMessages : BaseDiagnosticRendererFactory() {
         map.put(USELESS_CAST, "No cast needed")
         map.put(UNCHECKED_CAST, "Unchecked cast: ''{0}'' to ''{1}''", RENDER_TYPE, RENDER_TYPE)
         map.put(USELESS_IS_CHECK, "Check for instance is always ''{0}''", TO_STRING)
+        map.put(DYNAMIC_NOT_ALLOWED, "Dynamic types are not allowed in this position");
         map.put(IS_ENUM_ENTRY, "'is' over enum entry is not allowed, use comparison instead")
         map.put(ENUM_ENTRY_AS_TYPE, "Use of enum entry names as types is not allowed, use enum type instead")
 
diff --git a/compiler/testData/diagnostics/testsWithJsStdLib/dynamicTypes/dynamicCastTarget.fir.kt b/compiler/testData/diagnostics/testsWithJsStdLib/dynamicTypes/dynamicCastTarget.fir.kt
index 60eea0bca92..ac950599641 100644
--- a/compiler/testData/diagnostics/testsWithJsStdLib/dynamicTypes/dynamicCastTarget.fir.kt
+++ b/compiler/testData/diagnostics/testsWithJsStdLib/dynamicTypes/dynamicCastTarget.fir.kt
@@ -1,23 +1,23 @@
 // !DIAGNOSTICS: -REDUNDANT_NULLABLE
 
 fun test(d: Any, dl: Collection<dynamic>) {
-    d as dynamic
-    d as dynamic?
+    d as <!DYNAMIC_NOT_ALLOWED!>dynamic<!>
+    d as <!DYNAMIC_NOT_ALLOWED!>dynamic?<!>
 
-    d as? dynamic
-    d as? dynamic?
+    d as? <!DYNAMIC_NOT_ALLOWED!>dynamic<!>
+    d as? <!DYNAMIC_NOT_ALLOWED!>dynamic?<!>
 
-    d is dynamic
-    d is dynamic?
+    d is <!DYNAMIC_NOT_ALLOWED!>dynamic<!>
+    d is <!DYNAMIC_NOT_ALLOWED!>dynamic?<!>
 
-    d !is dynamic
-    d !is dynamic?
+    d !is <!DYNAMIC_NOT_ALLOWED!>dynamic<!>
+    d !is <!DYNAMIC_NOT_ALLOWED!>dynamic?<!>
 
     when (d) {
-        is dynamic -> {}
-        is dynamic? -> {}
-        !is dynamic -> {}
-        !is dynamic? -> {}
+        is <!DYNAMIC_NOT_ALLOWED!>dynamic<!> -> {}
+        is <!DYNAMIC_NOT_ALLOWED!>dynamic?<!> -> {}
+        !is <!DYNAMIC_NOT_ALLOWED!>dynamic<!> -> {}
+        !is <!DYNAMIC_NOT_ALLOWED!>dynamic?<!> -> {}
     }
 
     dl as List<dynamic>