Myrtle Hildred Blewett (born Myrtle Hildred Hunt; 28 May 1911 – 13 June 2004) was a Canadian accelerator physicist.^[1]

Blewett was born on 28 May 1911 in Toronto, Ontario.^[2] She graduated from the University of Toronto in 1935 with a BA in physics and mathematics. In 1938, Blewett joined Cornell University as a graduate student, with Hans Bethe as her thesis supervisor. However, due to the United States entrance to the second world war, her thesis work remained incomplete.^[3]

Blewett started her career at General Electric, where she devised a technique for controlling smoke pollution from factory chimneys in the 1940s.^[1] She and her husband John Blewett were part of the initial team at Brookhaven National Laboratory.^[4] In the early 1950s Blewett contributed to the design of CERN’s first high-energy accelerator, the Proton Synchrotron, while also working on a similar machine proposed for Brookhaven.^[5] She then worked at Argonne National Laboratory before finally joining CERN in 1969.^[3]

Following her retirement from CERN in 1977, Blewett retired to Vancouver. She died on 13 June 2004, and was commemorated by CERN colleagues Maria Fidecaro and Christine Sutton.^[3] She left much of her estate to the American Physical Society, founding the Blewett Scholarship for women physicists who return to the field after a break in their careers.^[1]

Blewett married John Blewett in 1936, who was also an accelerator physicist, and later divorced in 1960s.