Yau Ma Tei, formerly named Waterloo after Waterloo Road, is an MTR station located in Yau Ma Tei, Kowloon. It is served by the Kwun Tong line and the Tsuen Wan line. The station opened on 22 December 1979 and was renamed as Yau Ma Tei on 31 May 1985 along with Argyle and Chater (Central).

The Kwun Tong line is a rapid transit line of the MTR network in Hong Kong, coloured green on the MTR map. Starting at Whampoa in Hung Hom and ending at Tiu Keng Leng in Tseung Kwan O, Sai Kung, the route has 17 stations and takes 35 minutes to complete. The Kwun Tong line is one of the busiest railway lines on the network connecting the central and the eastern portions of Kowloon via Wong Tai Sin. The line is mostly underground, but includes a lengthy elevated section, and runs generally in an east-west direction. During the morning rush hour, the Kwun Tong line utilises 33 trains running at 29tph to achieve a route capacity of 85,000 pphpd.