Denis Thomas Keogh (1838 - 24 August 1911) was a member of the Queensland Legislative Assembly.^[1]

Keogh was born at Galway, Ireland, the son of Thomas Joseph Keogh^[1] and his wife Margaret (née O'Toole).^[2] He was educated at St. Patrick's College, Thurles in Tipperary and St Thomas' College in Newbridge. He arrived at Melbourne in 1854, working as a clerk and an auctioneer before moving to Queensland in 1859. Here he managed Alderton and Juandah stations. From 1862 until his death he was a storekeeper in Ipswich.^[1]

He married Agnes McPhail in 1858 (died 1899)^[2] and together had one daughter. Keogh died on a goods train bound for Ipswich in August 1911^[1] and his funeral proceeded from his Brisbane Street residence to the Ipswich General Cemetery.^[3]

Keogh, at first representing Labour, won the seat of Rosewood at the 1896 Queensland Colonial election, but the election was declared void and a by-election was called. He won again and held the seat until 1902 when he was defeated by Robert Hodge. Hodge however was unseated by petition in December 1904^[4] and Keogh was appointed to represent Rosewood once again. He went on to hold the seat until his death in 1911.^[1]