Thomas Phinn, QC (c. 1814 – 31 October 1866) was a British barrister and Liberal Party politician.^[1] He held various positions in the Admiralty of the United Kingdom in the mid-19th century.

Born in Bath, Somerset, Phinn was educated at Eton College and Exeter College, Oxford. He read for the bar at the Inner Temple, being called in 1840.^[2] He was elected at the 1852 general election as Member of Parliament for Bath, but held that seat for only three years, until 1855.^[3]

He was appointed Counsel to the Admiralty and Judge Advocate of the Fleet on 17  April 1854,^[4] and continued in that office until appointed Second Secretary to the Admiralty on 22  May 1855,^[5] He was made a Queen's Counsel in 1857.

a post which required his resignation from the House of Commons. He resigned from the Admiralty on 7  May 1857, but was re-appointed Counsel and Judge-Advocate on 12  November 1863, and held that post until his death on 31  October 1866, in London.^[4][6]