Thomas Icely (3 November 1797 – 13 February 1874) was an early colonial New South Wales landholder and stockbreeder. As a nominee Legislative Councillor from 1843 to the establishment of responsible government in 1856, he was a consistent supporter of the Governor. He served a second term as a life appointee to the Legislative Council from 1864. The beneficiary of large land grants to which he added purchased land holdings, his main holding from 1831 was Coombing Park. To support this holding, the village of Mandurama was established in 1876.
His name is associated with the introduction of Shorthorn stock into Australia.
He was the first lessee of Elizabeth Farm to which he retired with his family in 1869 and where he died on 13 February 1874.