Sara A. Underwood (21 July 1838 – 16 March 1911)[1] was a prominent English-born American freethought lecturer and writer, and an active part of the movement for women's suffrage.

[2] She married Benjamin Franklin Underwood on 6 September 1862, the partnership described as 'a union of kindred minds as well as hearts'.

'[3] As a lecturer, Sara A. Underwood became widely known 'for espousing liberal religious thought' for over three decades.

[5] Underwood spoke and wrote in the cause of equal rights for women,[2] and was treasurer of the National Woman Suffrage Association of Massachusetts.

[6][7] Sara A. Underwood died in a sanatorium in Jacksonville, Illinois, in the early hours of 16 March 1911.