Surfing on Sine Waves is a studio album by the musician and producer Richard D. James under the alias Polygon Window. It is the only album released under this name; James is better known as Aphex Twin. The record was released on 11 January 1993 through Warp Records. It entered the Dance Albums Chart at No. 2 on 23 January 1993. James' previous album, Selected Ambient Works 85–92, was then at No. 9 on the chart, and James briefly had two records in the Dance Albums Top 10 under different pseudonyms. The 2001 reissue edition includes the previously unreleased tracks "Portreath Harbour" and "Redruth School".