Caleb Andrew Stewart FRSE (16 September 1888 – 5 August 1959) was a 20th-century Scottish mathematician.
He was born on 16 September 1888 in Glasgow the son of John Stewart, a patternmaker.
He then studied Mathematics and Physics at Glasgow University graduating MA in 1909, BSc in 1910.
Winning a Ferguson Scholarship he attended Cambridge University gaining a further BA in 1912.
His proposers were Robert Pollock Gillespie, Richard Robb, Alexander Aitken and Daniel Edwin Rutherford.