Cameron Leigh Stewart FRSC is a Canadian mathematician.

He has made numerous contributions to number theory, in particular to work on the abc conjecture.

In 1976 he obtained, with Alan Baker, an effective improvement to Liouville's Theorem.

is the number of distinct primes dividing a large divisor

In 1995 he obtained, along with Jaap Top, the existence of infinitely many quadratic, cubic, and sextic twists of elliptic curves of large rank.

In 1991 and 2001 respectively, he obtained, along with Kunrui Yu, the best unconditional estimates for the abc conjecture.

He earned his doctorate from the University of Cambridge in 1976, under the supervision of Alan Baker.

He was elected Fellow of the Royal Society of Canada in 1989.

Since 2003 he has held a Canada Research Chair (tier 1).

[3] He was selected to give the annual Isidore and Hilda Dressler Lecture at Kansas State University in 2015.

He was elected as a fellow of the Canadian Mathematical Society in 2019.