Ramsay is a single-member electoral district for the South Australian House of Assembly.

It is named after Alexander Ramsay, who was general manager of the South Australian Housing Trust for 25 years.

It is a 24.7 km² suburban electorate north of Adelaide—based on the angle between Main North Road and the Port Wakefield Road, Ramsay covers the outer northern Adelaide suburbs of Brahma Lodge, Burton, Direk, a portion of Elizabeth South, Elizabeth Vale, a portion of Paralowie, Salisbury, Salisbury South, Salisbury Plain and Salisbury North.

A 2012 Ramsay by-election occurred on 11 February as a result of Mike Rann's resignation from parliament, Labor easily retained the seat and maintained the largest Labor seat margin.

At the 2020 redistribution, Ramsay gained the suburbs of Brahma Lodge, Burton, Direk, Elizabeth Vale and Salisbury South.