Denis Aloysius "Alan" O'Donognue (3 June 1891 – 10 February 1959) was an Australian rules footballer who played for Richmond and South Melbourne in the VFL.
He started his career at Richmond but only managed the one season and in 1914 made his debut for South Melbourne.
In that year's Grand Final he played as a centre half forward in their losing side.
He was a member of South Melbourne's 1918 premiership team though, in what would be his last game of league football he was a centre half back in their five-point win over Collingwood.
This Australian rules football biography of a person born in 1891 is a stub.