Gerald Patrick Desmond Hartigan (30 December 1884 – 7 January 1955) was a South African cricketer who played in five Test matches from 1912 to 1914.

Hartigan was born in King William's Town in the Cape Colony, and attended St Aidan's School there.^[1] A right-handed batsman and right-arm fast-medium bowler, he made his first-class career with Border, taking 92 wickets and scoring three centuries.^[2] His highest score of 176 came against Eastern Province in 1910–11.^[3]

Hartigan was one of the most successful batsmen in South African first-class cricket in 1910–11 and 1911–12, scoring 698 runs at an average of 63.45.^[4][5] He was selected to tour England for the 1912 Triangular Tournament. He scored 103 in the innings victory over Worcestershire early in the tour,^[6] but was otherwise unsuccessful, playing in only two of South Africa's six Tests before fracturing his arm during one match while throwing the ball in from the field.^[3] He played in the first three Tests when England toured South Africa in 1913–14, top-scoring with 51 in the first innings of the Second Test.^[7]

Hartigan also played six matches of soccer for South Africa.^[8] He toured Argentina with the South African team in 1906, and played at home against England in 1911.^[9]