Leo Moser (11 April 1921, Vienna – 9 February 1970, Edmonton) was an Austrian-Canadian mathematician, best known for his polygon notation.
A native of Vienna, Leo Moser immigrated with his parents to Canada at the age of three.
After two years of teaching he went to the University of North Carolina to complete a PhD, supervised by Alfred Brauer.
He took a position at Texas Technical College for one year, and joined the faculty of the University of Alberta in 1951, where he remained until his death at the age of 48.
In 1966, Moser posed the question "What is the region of smallest area which will accommodate every planar arc of length one?".