Timothy Joseph O'Donovan (4 April 1881 – 1951) was a Farmers' Party and Fine Gael politician from County Cork in Ireland. He was a Teachta Dála (TD) from 1923 to 1944, then a senator from 1944 until his death, serving as Cathaoirleach of Seanad Éireann from 1948 to 1951.
O'Donovan was elected at the 1923 general election to the 4th Dáil as a Farmers' Party TD for the Cork West constituency. He was re-elected at seven further general elections until his defeat at the 1944 general election to the 12th Dáil, after several changes of party affiliation. After the demise of the Farmers' Party in the 1920s, he was re-elected in 1933 as a National Centre Party TD, and when the National Party merged with Cumann na nGaedheal to form Fine Gael, he joined the new party.
After the loss of his Dáil seat in 1944, he was elected at the subsequent Seanad Éireann election to the 5th Seanad, on the Agricultural Panel. He was re-elected in 1948 to the 6th Seanad, serving as Cathaoirleach (chairperson) of the Seanad from 1948 to 1951. He died in 1951, shortly after his re-election to the 7th Seanad.