Mary E. Dillon (1886 – 20 October 1983) was an American businesswoman and president of Brooklyn Borough Gas Company.

Dillon left Erasmus Hall High School in her senior year when she needed to replace her sister in her job at the Brooklyn Borough Gas Company in 1903 because of her family's limited income.

[1] In the late 1920s, Dillon collaborated with another American member, Dr. Lillian Gilbreth, a leading expert in time and motion studies, on the creation of an efficient kitchen, equipped with gas powered appliances and named the "Kitchen Practical".

[3] Inspired by Dillon's criticisms of her own kitchen, it was designed on three principles: the correct and uniform height of working surfaces, a circular work place and a general "circular routing of working", all carefully analysed to reduce the time and effort required in the preparation of meals.

[3] Working in the Coney Island area, Dillon was also on the local school board.