Herbert Westren Turnbull (31 August 1885 – 4 May 1961) was an English mathematician.

[1][2][3] From 1921 to 1950 he was Regius Professor of Mathematics at the University of St Andrews.

[4] He was born in the Tettenhall district, on the outskirts of Wolverhampton on 31 August 1885, the eldest of five sons of William Peveril Turnbull, HM Inspector of Schools.

He was educated at Sheffield Grammar School then studied Mathematics at Cambridge University graduating MA.

His proposers were Arthur Crichton Mitchell, Sir Edmund Taylor Whittaker, Cargill Gilston Knott, and Herbert Stanley Allen.