Thomas Annan was a Scottish photographer, notable for being the first to record the bad housing conditions of the poor. Born in Dairsie, Fife he was one of seven children of John Annan, a flax spinner.
After his initial apprenticeship as a lithographic writer and engraver at the Fife Herald in Cupar, he moved to Glasgow in 1849 and worked as a lithographer and engraver for Joseph Swan until 1855. He set up business with George Berwick at 40 Woodlands Road, Glasgow, listing in the 1855 - 56 Glasgow post office directory as calotypists, practitioners of this early form of photography. In 1855, he photographed the ship RMS Persia, under construction on the Clyde, which was probably a commission by engineer, Robert Napier. This photograph was part of a group of images sent to the Photographic Exhibition in connection with the British Association.
After dissolving his previous partnership, he established himself in a photographic studio at 116 Sauchiehall Street during 1857. In 1859, the business moved to 200 Hope Street and he was also able to establish a printing works in Hamilton in 1863.