diff --git a/deployment/registry.py b/deployment/registry.py
index a75521aa..d756b4bc 100644
--- a/deployment/registry.py
+++ b/deployment/registry.py
@@ -1,5 +1,5 @@
 import json
-from collections import defaultdict
+from collections import OrderedDict, defaultdict
 from enum import Enum
 from pathlib import Path
 from typing import Dict, List, NamedTuple, Optional
@@ -148,7 +148,10 @@ class ConflictResolution(Enum):
 def _select_conflict_resolution(
     registry_1_entry, registry_1_filepath, registry_2_entry, registry_2_filepath
 ) -> ConflictResolution:
-    print(f"\n! Conflict detected for {registry_1_entry.name}:")
+    print(
+        f"\n! Conflict detected for {registry_1_entry.name} "
+        f"on chain id {registry_1_entry.chain_id}:"
+    )
     print(
         f"[1]: {registry_1_entry.name} at {registry_1_entry.address} " f"for {registry_1_filepath}"
     )
@@ -196,33 +199,49 @@ def merge_registries(
     deprecated_contracts = deprecated_contracts or []
 
     # Read the registries, excluding deprecated contracts
-    reg1 = {
-        e.name: e for e in read_registry(registry_1_filepath) if e.name not in deprecated_contracts
-    }
-    reg2 = {
-        e.name: e for e in read_registry(registry_2_filepath) if e.name not in deprecated_contracts
-    }
+    reg1 = defaultdict(OrderedDict)
+    reg2 = defaultdict(OrderedDict)
+
+    for e in read_registry(registry_1_filepath):
+        if e.name in deprecated_contracts:
+            continue
+        reg1[str(e.chain_id)][e.name] = e
+
+    for e in read_registry(registry_2_filepath):
+        if e.name in deprecated_contracts:
+            continue
+        reg2[str(e.chain_id)][e.name] = e
 
     merged: List[RegistryEntry] = list()
 
-    # Iterate over all unique contract names across both registries
-    conflicts, contracts = set(reg1) & set(reg2), set(reg1) | set(reg2)
-    for name in contracts:
-        entry_1, entry_2 = reg1.get(name), reg2.get(name)
-        conflict = name in conflicts and entry_1.chain_id == entry_2.chain_id
-        if conflict:
-            resolution = _select_conflict_resolution(
-                registry_1_entry=entry_1,
-                registry_2_entry=entry_2,
-                registry_1_filepath=registry_1_filepath,
-                registry_2_filepath=registry_2_filepath,
-            )
-            selected_entry = entry_1 if resolution == ConflictResolution.USE_1 else entry_2
+    # Iterate over all chains and unique contract names across both registries
+    all_chains = set(reg1) | set(reg2)
+    common_chains = set(reg1) & set(reg2)
+    for chain in all_chains:
+        reg1_chain_entries, reg2_chain_entries = reg1.get(str(chain), {}), reg2.get(str(chain), {})
+        if chain in common_chains:
+            # check for conflicting contracts
+            all_contracts = set(reg1_chain_entries) | set(reg2_chain_entries)
+            for name in all_contracts:
+                entry_1, entry_2 = reg1_chain_entries.get(name), reg2_chain_entries.get(name)
+                if entry_1 and entry_2:
+                    # entries for the same name (same chain)
+                    resolution = _select_conflict_resolution(
+                        registry_1_entry=entry_1,
+                        registry_2_entry=entry_2,
+                        registry_1_filepath=registry_1_filepath,
+                        registry_2_filepath=registry_2_filepath,
+                    )
+                    selected_entry = entry_1 if resolution == ConflictResolution.USE_1 else entry_2
+                else:
+                    selected_entry = entry_1 or entry_2
+
+                # commit the selected entry
+                merged.append(selected_entry)
         else:
-            selected_entry = entry_1 or entry_2
-
-        # commit the selected entry
-        merged.append(selected_entry)
+            # not a common chain so just move on right along
+            selected_entries = reg1_chain_entries or reg2_chain_entries
+            merged.extend(list(selected_entries.values()))
 
     # Write the merged registry to the specified output file path
     write_registry(entries=merged, filepath=output_filepath)