diff --git a/CHANGES.rst b/CHANGES.rst
index cf0aadf13be..73490ffcc88 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -4,6 +4,8 @@ Release 7.3.6 (in development)
 Bugs fixed
 ----------
 
+* #12295: Re-export all AST types in the C and C++ domains.
+  Patch by Adam Turner.
 
 Release 7.3.5 (released Apr 17, 2024)
 =====================================
diff --git a/sphinx/domains/c/__init__.py b/sphinx/domains/c/__init__.py
index 7a68606bcc8..903fa4c8bce 100644
--- a/sphinx/domains/c/__init__.py
+++ b/sphinx/domains/c/__init__.py
@@ -44,6 +44,59 @@
     from sphinx.environment import BuildEnvironment
     from sphinx.util.typing import ExtensionMetadata, OptionSpec
 
+# re-export objects for backwards compatibility
+# xref https://github.com/sphinx-doc/sphinx/issues/12295
+from sphinx.domains.c._ast import (  # NoQA: F401
+    ASTAlignofExpr,
+    ASTArray,
+    ASTAssignmentExpr,
+    ASTBase,
+    ASTBinOpExpr,
+    ASTBooleanLiteral,
+    ASTBracedInitList,
+    ASTCastExpr,
+    ASTCharLiteral,
+    ASTDeclarator,
+    ASTDeclaratorNameBitField,
+    ASTDeclaratorNameParam,
+    ASTDeclaratorParen,
+    ASTDeclaratorPtr,
+    ASTDeclSpecs,
+    ASTDeclSpecsSimple,
+    ASTEnum,
+    ASTEnumerator,
+    ASTExpression,
+    ASTFallbackExpr,
+    ASTFunctionParameter,
+    ASTIdExpression,
+    ASTInitializer,
+    ASTLiteral,
+    ASTMacro,
+    ASTMacroParameter,
+    ASTNumberLiteral,
+    ASTParameters,
+    ASTParenExpr,
+    ASTParenExprList,
+    ASTPostfixArray,
+    ASTPostfixCallExpr,
+    ASTPostfixDec,
+    ASTPostfixExpr,
+    ASTPostfixInc,
+    ASTPostfixMemberOfPointer,
+    ASTPostfixOp,
+    ASTSizeofExpr,
+    ASTSizeofType,
+    ASTStringLiteral,
+    ASTStruct,
+    ASTTrailingTypeSpec,
+    ASTTrailingTypeSpecFundamental,
+    ASTTrailingTypeSpecName,
+    ASTType,
+    ASTTypeWithInit,
+    ASTUnaryOpExpr,
+    ASTUnion,
+)
+
 logger = logging.getLogger(__name__)
 
 
diff --git a/sphinx/domains/cpp/__init__.py b/sphinx/domains/cpp/__init__.py
index 872b09ec93e..9e1f075f8b7 100644
--- a/sphinx/domains/cpp/__init__.py
+++ b/sphinx/domains/cpp/__init__.py
@@ -48,6 +48,98 @@
     from sphinx.environment import BuildEnvironment
     from sphinx.util.typing import ExtensionMetadata, OptionSpec
 
+# re-export objects for backwards compatibility
+# xref https://github.com/sphinx-doc/sphinx/issues/12295
+from sphinx.domains.cpp._ast import (  # NoQA: F401
+    ASTAlignofExpr,
+    ASTArray,
+    ASTAssignmentExpr,
+    ASTBase,
+    ASTBaseClass,
+    ASTBinOpExpr,
+    ASTBooleanLiteral,
+    ASTBracedInitList,
+    ASTCastExpr,
+    ASTCharLiteral,
+    ASTClass,
+    ASTCommaExpr,
+    ASTConcept,
+    ASTConditionalExpr,
+    ASTDeclarator,
+    ASTDeclaratorMemPtr,
+    ASTDeclaratorNameBitField,
+    ASTDeclaratorNameParamQual,
+    ASTDeclaratorParamPack,
+    ASTDeclaratorParen,
+    ASTDeclaratorPtr,
+    ASTDeclaratorRef,
+    ASTDeclSpecs,
+    ASTDeclSpecsSimple,
+    ASTDeleteExpr,
+    ASTEnum,
+    ASTEnumerator,
+    ASTExplicitCast,
+    ASTExplicitSpec,
+    ASTExpression,
+    ASTFallbackExpr,
+    ASTFoldExpr,
+    ASTFunctionParameter,
+    ASTIdExpression,
+    ASTInitializer,
+    ASTLiteral,
+    ASTNewExpr,
+    ASTNoexceptExpr,
+    ASTNoexceptSpec,
+    ASTNumberLiteral,
+    ASTOperator,
+    ASTOperatorBuildIn,
+    ASTOperatorLiteral,
+    ASTOperatorType,
+    ASTPackExpansionExpr,
+    ASTParametersQualifiers,
+    ASTParenExpr,
+    ASTParenExprList,
+    ASTPointerLiteral,
+    ASTPostfixArray,
+    ASTPostfixCallExpr,
+    ASTPostfixDec,
+    ASTPostfixExpr,
+    ASTPostfixInc,
+    ASTPostfixMember,
+    ASTPostfixMemberOfPointer,
+    ASTPostfixOp,
+    ASTRequiresClause,
+    ASTSizeofExpr,
+    ASTSizeofParamPack,
+    ASTSizeofType,
+    ASTStringLiteral,
+    ASTTemplateArgConstant,
+    ASTTemplateArgs,
+    ASTTemplateDeclarationPrefix,
+    ASTTemplateIntroduction,
+    ASTTemplateIntroductionParameter,
+    ASTTemplateKeyParamPackIdDefault,
+    ASTTemplateParam,
+    ASTTemplateParamConstrainedTypeWithInit,
+    ASTTemplateParamNonType,
+    ASTTemplateParams,
+    ASTTemplateParamTemplateType,
+    ASTTemplateParamType,
+    ASTThisLiteral,
+    ASTTrailingTypeSpec,
+    ASTTrailingTypeSpecDecltype,
+    ASTTrailingTypeSpecDecltypeAuto,
+    ASTTrailingTypeSpecFundamental,
+    ASTTrailingTypeSpecName,
+    ASTType,
+    ASTTypeId,
+    ASTTypeUsing,
+    ASTTypeWithInit,
+    ASTUnaryOpExpr,
+    ASTUnion,
+    ASTUserDefinedLiteral,
+)
+
 logger = logging.getLogger(__name__)