Sai Yee Street (Chinese: 洗衣街; lit. 'Clothes-Washing Street') is a street in Mong Kok, Kowloon, Hong Kong.
It runs south from Soy Street and ends north at Boundary Street. It is almost parallel to a number of other streets, including Tung Choi Street and Fa Yuen Street. The street runs one-way due north between Dundas Street and Argyle Street and two-ways between Argyle and Boundary Streets.
In 2019, the government planned to rename the street as Tiu Fu street (跳付街).