diff --git a/ibis/backends/trino/registry.py b/ibis/backends/trino/registry.py
index 7d25d633f223..347753395910 100644
--- a/ibis/backends/trino/registry.py
+++ b/ibis/backends/trino/registry.py
@@ -417,6 +417,7 @@ def _interval_from_integer(t, op):
         ops.ArraySort: fixed_arity(sa.func.array_sort, 1),
         ops.ArrayRemove: fixed_arity(sa.func.array_remove, 2),
         ops.ArrayUnion: fixed_arity(sa.func.array_union, 2),
+        ops.ArrayFlatten: unary(sa.func.flatten),
         ops.JSONGetItem: _json_get_item,
         ops.ExtractDayOfYear: unary(sa.func.day_of_year),
         ops.ExtractWeekOfYear: unary(sa.func.week_of_year),