diff --git a/src/sqlfluff/rules/L025.py b/src/sqlfluff/rules/L025.py
index 128a6e8e542..54a2cb1c56c 100644
--- a/src/sqlfluff/rules/L025.py
+++ b/src/sqlfluff/rules/L025.py
@@ -121,7 +121,9 @@ def is_alias_required(
                         dialect_name in cls._dialects_requiring_alias_for_values_clause
                     )
                 elif any(
-                    seg.is_type("select_statement")
+                    seg.is_type(
+                        "select_statement", "set_expression", "with_compound_statement"
+                    )
                     for seg in segment.iter_segments(expanding=("bracketed",))
                 ):
                     # The FROM expression is a derived table, i.e. a nested
diff --git a/test/fixtures/rules/std_rule_cases/L025.yml b/test/fixtures/rules/std_rule_cases/L025.yml
index 8b1290956f2..4454e4d0080 100644
--- a/test/fixtures/rules/std_rule_cases/L025.yml
+++ b/test/fixtures/rules/std_rule_cases/L025.yml
@@ -312,8 +312,28 @@ test_fail_snowflake_flatten_function:
     core:
       dialect: snowflake
 
-test_pass_derived_query_requires_alias:
+test_pass_derived_query_requires_alias_1:
+  # Case 1: Simple derived query
   pass_str: |
     SELECT * FROM (
         SELECT 1
     )  as a
+
+test_pass_derived_query_requires_alias_2:
+  # Case 2: Derived query uses set operation (UNION)
+  pass_str: |
+    SELECT * FROM (
+        SELECT col FROM dbo.tab
+        UNION
+        SELECT -1 AS col
+    ) AS a
+
+test_pass_derived_query_requires_alias_3:
+  # Case 3: Derived query includes a WITH statement
+  pass_str: |
+    SELECT * FROM (
+        WITH foo AS (
+            SELECT col FROM dbo.tab
+        )
+        SELECT * FROM foo
+    ) AS a