Sultan Sulaiman Royal Mosque is Selangor's royal mosque, which is located in Klang, Selangor, Malaysia. It was constructed by the British in the early 1930s and was officially opened in 1934 by the late Almarhum Sultan Sir Alaeddin Sulaiman Shah of Selangor and the British's Federated Malay States High Commissioner Sir Lawrence Nuuns Guillemard.
The mosque's architecture is a combination of Western Art Deco, Neoclassical and local Islamic styles.
Its interesting features include the Tangga Diraja (royal stairs) from Istana Alam Shah and a royal mausoleum. The late Sultan Salahuddin was buried in the mosque's grounds.