One By One is a British television series made by the BBC between 1984 and 1987.

The series, created by Anthony Read, followed the career of international veterinarian David Taylor and his work caring for exotic animals at zoos in Britain, from the 1950s to the 1970s. Each series was set during a different decade, with exteriors filmed at Dudley Zoo, Chester Zoo and Knowsley Safari Park. Thirty-two episodes were made in total.

Rob Heyland starred as Turner, while other major cast members included James Ellis, Sonia Graham, Peter Gilmore, Heather James, Catherine Schell, Peter Jeffrey, Andrew Robertson and Christina Nagy.