John Collin (18 October 1928 – 25 February 1987) was a British actor frequently seen on UK television during the 1960s and 1970s, mainly in supporting roles such as ITC's The Saint (S5/E21).

[1] Collin's best-known role was as Detective Sergeant Haggar in the long running BBC police series Z-Cars.

[2] Another notable role was as Guardian officer Tom Weston in the 1971 ITV political fantasy The Guardians.

[3] He also played Mr. Alderson, the father-in-law of James Herriot, in both the television movie All Creatures Great and Small and the subsequent television series.

[4][5][6]