diff --git a/include/circt/Dialect/RTG/IR/RTGOps.td b/include/circt/Dialect/RTG/IR/RTGOps.td
index a270137bf59d..9f48655ec47a 100644
--- a/include/circt/Dialect/RTG/IR/RTGOps.td
+++ b/include/circt/Dialect/RTG/IR/RTGOps.td
@@ -224,6 +224,23 @@ def BagDifferenceOp : RTGOp<"bag_difference", [
   }];
 }
 
+def BagUnionOp : RTGOp<"bag_union", [
+  Pure, SameOperandsAndResultType, Commutative
+]> {
+  let summary = "computes the union of bags";
+  let description = [{
+    Computes the union of the given bags. The list of sets must contain at
+    least one element.
+  }];
+
+  let arguments = (ins Variadic<BagType>:$bags);
+  let results = (outs BagType:$result);
+
+  let assemblyFormat = [{
+    $bags `:` qualified(type($result)) attr-dict
+  }];
+}
+
 //===- Test Specification Operations --------------------------------------===//
 
 def TestOp : RTGOp<"test", [
diff --git a/include/circt/Dialect/RTG/IR/RTGVisitors.h b/include/circt/Dialect/RTG/IR/RTGVisitors.h
index 4c4babb96edc..0423bb72f699 100644
--- a/include/circt/Dialect/RTG/IR/RTGVisitors.h
+++ b/include/circt/Dialect/RTG/IR/RTGVisitors.h
@@ -34,7 +34,7 @@ class RTGOpVisitor {
         .template Case<SequenceOp, SequenceClosureOp, SetCreateOp,
                        SetSelectRandomOp, SetDifferenceOp, SetUnionOp, TestOp,
                        InvokeSequenceOp, BagCreateOp, BagSelectRandomOp,
-                       BagDifferenceOp, TargetOp, YieldOp>(
+                       BagDifferenceOp, BagUnionOp, TargetOp, YieldOp>(
             [&](auto expr) -> ResultType {
               return thisCast->visitOp(expr, args...);
             })
@@ -93,6 +93,7 @@ class RTGOpVisitor {
   HANDLE(BagCreateOp, Unhandled);
   HANDLE(BagSelectRandomOp, Unhandled);
   HANDLE(BagDifferenceOp, Unhandled);
+  HANDLE(BagUnionOp, Unhandled);
   HANDLE(TestOp, Unhandled);
   HANDLE(TargetOp, Unhandled);
   HANDLE(YieldOp, Unhandled);
diff --git a/lib/Dialect/RTG/Transforms/ElaborationPass.cpp b/lib/Dialect/RTG/Transforms/ElaborationPass.cpp
index b99ce9a1126c..a93068476b62 100644
--- a/lib/Dialect/RTG/Transforms/ElaborationPass.cpp
+++ b/lib/Dialect/RTG/Transforms/ElaborationPass.cpp
@@ -598,6 +598,20 @@ class Elaborator : public RTGOpVisitor<Elaborator, FailureOr<DeletionKind>,
     return DeletionKind::Delete;
   }
 
+  FailureOr<DeletionKind>
+  visitOp(BagUnionOp op, function_ref<void(Operation *)> addToWorklist) {
+    MapVector<ElaboratorValue *, uint64_t> result;
+    for (auto bag : op.getBags()) {
+      auto *val = cast<BagValue>(state.at(bag));
+      for (auto [el, multiple] : val->getBag())
+        result[el] += multiple;
+    }
+
+    internalizeResult<BagValue>(op.getResult(), std::move(result),
+                                op.getType());
+    return DeletionKind::Delete;
+  }
+
   FailureOr<DeletionKind>
   dispatchOpVisitor(Operation *op,
                     function_ref<void(Operation *)> addToWorklist) {
diff --git a/test/Dialect/RTG/IR/basic.mlir b/test/Dialect/RTG/IR/basic.mlir
index 85298992c4d8..ae49bbf9bb18 100644
--- a/test/Dialect/RTG/IR/basic.mlir
+++ b/test/Dialect/RTG/IR/basic.mlir
@@ -47,13 +47,15 @@ rtg.sequence @bags {
   // CHECK: [[BAG:%.+]] = rtg.bag_create (%arg2 x %arg0, %arg2 x %arg1) : i32 {rtg.some_attr}
   // CHECK: [[R:%.+]] = rtg.bag_select_random [[BAG]] : !rtg.bag<i32> {rtg.some_attr}
   // CHECK: [[EMPTY:%.+]] = rtg.bag_create : i32
-  // CHECK: rtg.bag_difference [[BAG]], [[EMPTY]] : !rtg.bag<i32> {rtg.some_attr}
+  // CHECK: [[DIFF:%.+]] = rtg.bag_difference [[BAG]], [[EMPTY]] : !rtg.bag<i32> {rtg.some_attr}
   // CHECK: rtg.bag_difference [[BAG]], [[EMPTY]] inf : !rtg.bag<i32>
+  // CHECK: rtg.bag_union [[BAG]], [[EMPTY]], [[DIFF]] : !rtg.bag<i32>
   %bag = rtg.bag_create (%arg2 x %arg0, %arg2 x %arg1) : i32 {rtg.some_attr}
   %r = rtg.bag_select_random %bag : !rtg.bag<i32> {rtg.some_attr}
   %empty = rtg.bag_create : i32
   %diff = rtg.bag_difference %bag, %empty : !rtg.bag<i32> {rtg.some_attr}
   %diff2 = rtg.bag_difference %bag, %empty inf : !rtg.bag<i32>
+  %union = rtg.bag_union %bag, %empty, %diff : !rtg.bag<i32>
 }
 
 // CHECK-LABEL: rtg.target @empty_target : !rtg.dict<> {
diff --git a/test/Dialect/RTG/IR/errors.mlir b/test/Dialect/RTG/IR/errors.mlir
index 2d5f147f234b..eb030cfbf7f8 100644
--- a/test/Dialect/RTG/IR/errors.mlir
+++ b/test/Dialect/RTG/IR/errors.mlir
@@ -73,3 +73,10 @@ rtg.sequence @seq {
   // expected-error @below {{expected 1 or more operands, but found 0}}
   rtg.set_union : !rtg.set<i32>
 }
+
+// -----
+
+rtg.sequence @seq {
+  // expected-error @below {{expected 1 or more operands, but found 0}}
+  rtg.bag_union : !rtg.bag<i32>
+}
diff --git a/test/Dialect/RTG/Transform/elaboration.mlir b/test/Dialect/RTG/Transform/elaboration.mlir
index d5545d17b952..5343404d02f6 100644
--- a/test/Dialect/RTG/Transform/elaboration.mlir
+++ b/test/Dialect/RTG/Transform/elaboration.mlir
@@ -38,10 +38,13 @@ rtg.test @bagOperations : !rtg.dict<> {
   // CHECK-NEXT: [[V5:%.+]] = rtg.bag_create ([[V1]] x [[V0]]) : i32
   // CHECK-NEXT: func.call @dummy4([[V0]], [[V0]], [[V4]], [[V5]]) :
   %multiple = arith.constant 8 : index
+  %seven = arith.constant 7 : index
   %one = arith.constant 1 : index
   %0 = arith.constant 2 : i32
   %1 = arith.constant 3 : i32
-  %bag = rtg.bag_create (%multiple x %0, %multiple x %1) : i32
+  %bag0 = rtg.bag_create (%seven x %0, %multiple x %1) : i32
+  %bag1 = rtg.bag_create (%one x %0) : i32
+  %bag = rtg.bag_union %bag0, %bag1 : !rtg.bag<i32>
   %2 = rtg.bag_select_random %bag : !rtg.bag<i32> {rtg.elaboration_custom_seed = 3}
   %new_bag = rtg.bag_create (%one x %2) : i32
   %diff = rtg.bag_difference %bag, %new_bag : !rtg.bag<i32>