Thomas Furly Forster (1761–1825), was an English botanist.
Forster was born in Bond Court, Walbrook, 5 September 1761, the eldest son of Edward Forster the Elder and Susanna his wife. His father retired to Walthamstow in 1764, and, being an admirer of Jean-Jacques Rousseau, brought up his son on his principles. From his uncle Benjamin Forster he acquired a taste for antiquities, coins, prints, and plants. He was introduced to the Linnean system of classification by the Rev. John Dixon, and was further encouraged in his studies by Joseph Cockfield of Upton, Michael Tyson, Sir John Cullum, and Richard Warner, author of the Plantæ Woodfordienses (1771).
He was one of the first fellows of the Linnean Society, and he visited Tunbridge Wells annually. From 1796 to 1823 he mainly resided at Clapton, and, as he had grown hardy plants in his home at Walthamstow, then devoted himself to greenhouse exotics, giving assistance to the Messrs. Loddiges in establishing their nursery at Hackney.
In 1823 he moved to Walthamstow on the death of his mother, and died there 28 October 1825. He was a member of many scientific and philanthropic societies, and among his friends were Richard Porson and Richard Gough, as well as botanists: Sir James Edward Smith, Sir Joseph Banks, Jonas Dryander, James Dickson, Robert Brown, and Adam Afzelius.