Rumney (Welsh: Tredelerch) is a district and community in the east of the city of Cardiff, Wales.

New industrial and business estates have been developed alongside existing ones on Lamby Way providing employment opportunities.

The Rompney Castle pub, with a mock-medieval tower, was built on Wentloog Road in 1871.

Plans to demolish it and replace it with apartments were rejected in 2022 by Cardiff Council planners.

It is bounded by the electoral wards of Pontprennau & Old St. Mellons to the north; Trowbridge to the east; Splott to the southwest; Penylan to the west; and Llanrumney to the northwest.