Mary Bentley Thomas (December 13, 1845 – February 11, 1923) was an American suffragist and Maryland Woman Suffrage Association president from 1894 to 1904.

[1] She wrote to the governors of Wyoming, Utah, Idaho, and Colorado, and asked questions about women's suffrage, which was legal in all four states; she published the responses as a broadside.

[8] Mary Bentley married dairyman Edward Porter Thomas in 1865.

[1] Her scrapbook of newspaper clippings, in the collection of the Sandy Spring Museum, is available online at Digital Maryland.

[9] In 2021, a historical marker was erected in Sandy Spring, Maryland, noting Thomas and Miller's work on woman's suffrage; several of Thomas's descendants attended the marker's unveiling.