Cypra Cecilia Krieger-Dunaij (9 April 1894 – 17 August 1974) was an Austro-Hungarian (more specifically, Galician)-born mathematician of Jewish ancestry who lived and worked in Canada.
Krieger was the third person (and first woman) to earn a Ph.D in mathematics from a university in Canada, in 1930, as well as the third woman to have been awarded a doctorate in any discipline in Canada.
Krieger is well known for having translated two works of Waclaw Sierpinski in general topology.
The Krieger–Nelson Prize, awarded annually by the Canadian Mathematical Society since 1995 for outstanding research by a female mathematician, is named in honour of Krieger and Evelyn Nelson.