Thomas Annan (1829–1887) 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 RMS Persia, under construction on the Clyde, which was probably a commission by engineer, Robert Napier.
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. First interested largely in architectural photography and then portraits, as well as photographing artworks and maps, in 1866 Annan was commissioned by the Glasgow City Improvement Trust to photograph slum areas. It was this series of photographs, created between 1868 and 1871, entitled the Old Closes and Streets of Glasgow, that ensured his prosperity.
In 1869, Thomas purchased the contents of Rock House, which belonged David Octavius Hill, which included many of Hill's photographs and negatives. These were eventually exhibited by Thomas' son, James Craig Annan, and reproduced in photogravure in Alfred Stieglitz's journal Camera Work.
His works include:
After his death in 1887, the firm continued to produce volumes of photography, including the third photogravure edition of Old Closes and Streets, in 1900.