Frederick Pieter "Lammetjie" Luyt (26 February 1888 – 6 June 1965) was a South African sportsman who played international rugby union for South Africa. He also played first-class cricket for Western Province cricket team. Luyt played seven Tests for South Africa. He appeared in all three Tests that South Africa played against the touring British Lions in 1910, two of them beside his brother . His other four Tests came during South Africa's 1912–13 South Africa rugby union tour of Britain and Ireland.