diff --git a/common/changes/@itwin/ecschema-editing/remove-ecrule-102_2023-04-05-12-44.json b/common/changes/@itwin/ecschema-editing/remove-ecrule-102_2023-04-05-12-44.json
new file mode 100644
index 000000000000..e85ccb56ec5b
--- /dev/null
+++ b/common/changes/@itwin/ecschema-editing/remove-ecrule-102_2023-04-05-12-44.json
@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@itwin/ecschema-editing",
+      "comment": "Removed obsolete EC rule 102 - Abstract class must have abstract base class.",
+      "type": "none"
+    }
+  ],
+  "packageName": "@itwin/ecschema-editing"
+}
\ No newline at end of file
diff --git a/core/ecschema-editing/src/Validation/ECRules.ts b/core/ecschema-editing/src/Validation/ECRules.ts
index f7c7e0ac2a3f..1194a2057128 100644
--- a/core/ecschema-editing/src/Validation/ECRules.ts
+++ b/core/ecschema-editing/src/Validation/ECRules.ts
@@ -58,6 +58,7 @@ export const DiagnosticCodes = {
   // Class Rule Codes (100-199)
   BaseClassIsSealed: getCode(100),
   BaseClassOfDifferentType: getCode(101),
+  // EC-102 has been deprecated. Leaving the code here to prevent re-use.
   AbstractClassWithNonAbstractBase: getCode(102),
 
   // CA Container Rule Codes (500-599)
@@ -111,7 +112,7 @@ export const Diagnostics = {
   BaseClassIsOfDifferentType: createClassDiagnosticClass<[string, string, string]>(DiagnosticCodes.BaseClassOfDifferentType,
     "Class '{0}' cannot derive from base class '{1}' of type '{2}'."),
 
-  /** EC-102: Required message parameters: childClass.FullName, baseClass.FullName */
+  /** **DEPRECATED** EC-102: Required message parameters: childClass.FullName, baseClass.FullName */
   AbstractClassWithNonAbstractBase: createClassDiagnosticClass<[string, string]>(DiagnosticCodes.AbstractClassWithNonAbstractBase,
     "Abstract Class '{0}' cannot derive from base class '{1}' because it is not an abstract class."),
 
@@ -197,7 +198,6 @@ export const ECRuleSet: IRuleSet = {
   classRules: [
     baseClassIsSealed,
     baseClassIsOfDifferentType,
-    abstractClassWithNonAbstractBase,
   ],
   propertyRules: [
     incompatibleValueTypePropertyOverride,
@@ -298,22 +298,6 @@ export async function* baseClassIsOfDifferentType(ecClass: AnyClass): AsyncItera
   yield new Diagnostics.BaseClassIsOfDifferentType(ecClass, [ecClass.fullName, baseClass.fullName, itemType]);
 }
 
-/**
- * EC Rule: Abstract class cannot derive from a non-abstract base class.
- * @internal
- */
-export async function* abstractClassWithNonAbstractBase(ecClass: AnyClass): AsyncIterable<ClassDiagnostic<any[]>> {
-  if (ecClass.modifier !== ECClassModifier.Abstract || !ecClass.baseClass)
-    return;
-
-  const baseClass = await ecClass.baseClass;
-  // return if rule passed
-  if (baseClass.modifier === ECClassModifier.Abstract)
-    return;
-
-  yield new Diagnostics.AbstractClassWithNonAbstractBase(ecClass, [ecClass.fullName, baseClass.fullName]);
-}
-
 /**
  * EC Rule: When overriding a class primitive property, the child and base property must be of the same type (string, number, etc...).
  * @internal
diff --git a/core/ecschema-editing/src/test/Validation/ECRules/ClassRules.test.ts b/core/ecschema-editing/src/test/Validation/ECRules/ClassRules.test.ts
index b436988147dd..8fdeacc5ad9b 100644
--- a/core/ecschema-editing/src/test/Validation/ECRules/ClassRules.test.ts
+++ b/core/ecschema-editing/src/test/Validation/ECRules/ClassRules.test.ts
@@ -98,73 +98,4 @@ describe("ClassRule tests", () => {
       expect(false, "Rule should have passed").to.be.true;
     }
   });
-
-  it("AbstractClassWithNonAbstractBase, base class is sealed, rule violated.", async () => {
-    const baseClass = new EntityClass(schema, "TestBase", ECClassModifier.Sealed);
-    const entityClass = new EntityClass(schema, "TestClass", ECClassModifier.Abstract);
-    entityClass.baseClass = new DelayedPromiseWithProps(baseClass.key, async () => baseClass);
-
-    const result = Rules.abstractClassWithNonAbstractBase(entityClass);
-    expect(result).not.undefined;
-    let resultHasEntries = false;
-    for await (const diagnostic of result) {
-      resultHasEntries = true;
-      expect(diagnostic.ecDefinition).to.equal(entityClass);
-      expect(diagnostic.messageArgs).to.eql([entityClass.fullName, baseClass.fullName]);
-      expect(diagnostic.category).to.equal(DiagnosticCategory.Error);
-      expect(diagnostic.code).to.equal(Rules.DiagnosticCodes.AbstractClassWithNonAbstractBase);
-      expect(diagnostic.diagnosticType).to.equal(DiagnosticType.SchemaItem);
-    }
-    expect(resultHasEntries, "expected rule to return an AsyncIterable with entries.").to.be.true;
-  });
-
-  it("AbstractClassWithNonAbstractBase, base class modifier is `none`, rule violated.", async () => {
-    const baseClass = new EntityClass(schema, "TestBase", ECClassModifier.None);
-    const entityClass = new EntityClass(schema, "TestClass", ECClassModifier.Abstract);
-    entityClass.baseClass = new DelayedPromiseWithProps(baseClass.key, async () => baseClass);
-
-    const result = Rules.abstractClassWithNonAbstractBase(entityClass);
-    expect(result).not.undefined;
-    let resultHasEntries = false;
-    for await (const diagnostic of result) {
-      resultHasEntries = true;
-      expect(diagnostic.ecDefinition).to.equal(entityClass);
-      expect(diagnostic.messageArgs).to.eql([entityClass.fullName, baseClass.fullName]);
-      expect(diagnostic.category).to.equal(DiagnosticCategory.Error);
-      expect(diagnostic.code).to.equal(Rules.DiagnosticCodes.AbstractClassWithNonAbstractBase);
-      expect(diagnostic.diagnosticType).to.equal(DiagnosticType.SchemaItem);
-    }
-    expect(resultHasEntries, "expected rule to return an AsyncIterable with entries.").to.be.true;
-  });
-
-  it("AbstractClassWithNonAbstractBase, no base class, rule passes.", async () => {
-    const entityClass = new EntityClass(schema, "TestClass", ECClassModifier.Abstract);
-
-    const result = Rules.abstractClassWithNonAbstractBase(entityClass);
-    for await (const _diagnostic of result) {
-      expect(false, "Rule should have passed").to.be.true;
-    }
-  });
-
-  it("AbstractClassWithNonAbstractBase, base class is abstract, rule passes.", async () => {
-    const baseClass = new EntityClass(schema, "TestBase", ECClassModifier.Abstract);
-    const entityClass = new EntityClass(schema, "TestClass", ECClassModifier.Abstract);
-    entityClass.baseClass = new DelayedPromiseWithProps(baseClass.key, async () => baseClass);
-
-    const result = Rules.abstractClassWithNonAbstractBase(entityClass);
-    for await (const _diagnostic of result) {
-      expect(false, "Rule should have passed").to.be.true;
-    }
-  });
-
-  it("AbstractClassWithNonAbstractBase, class is not abstract, rule passes.", async () => {
-    const baseClass = new EntityClass(schema, "TestBase", ECClassModifier.Sealed);
-    const entityClass = new EntityClass(schema, "TestClass", ECClassModifier.None);
-    entityClass.baseClass = new DelayedPromiseWithProps(baseClass.key, async () => baseClass);
-
-    const result = Rules.abstractClassWithNonAbstractBase(entityClass);
-    for await (const _diagnostic of result) {
-      expect(false, "Rule should have passed").to.be.true;
-    }
-  });
 });