Maindy (, meaning 'stone house') is a district of the city of Cardiff, Wales. Its boundaries are not formally recognised by Cardiff Council, and the district falls within the Cathays ward and Gabalfa.
A notable facility in the area is the Maindy Centre consisting of a cycle track and swimming pool. The cycle track was used in the 1958 British Empire and Commonwealth Games.
The area is served by the Capital City Green bus route.