Sydney "Syd" Ashley (23 February 1880 – 20 January 1959) was a South African international rugby union player. Born in Cape Town, he attended Diocesan College before playing provincial rugby for Western Province. He made his only Test appearance for South Africa during Great Britain's 1903 tour. He played at centre for the 2nd Test of the series, a 0–0 draw in Kimberley. Ashley died in 1959, in Somerset West, at the age of 78.