Isabelle Ahearn O'Neill (June 8, 1880 – March 17, 1975) was a stage and screen actor of the silent film era, a suffragist, and the first woman elected to the Rhode Island Legislature.

Isabelle Florence Ahearn was born on June 8, 1880 in Woonsocket, Rhode Island, the youngest of thirteen children of Mary J.

[2] Ahearn also worked as an actor for nearly two decades (1900–18), taking both lead and supporting roles in primarily summer stock and vaudeville shows in Rhode Island and New York.

[6] Her papers are held by the Rhode Island Historical Society and include scrapbooks from her years as an actor and elocution teacher, as well as a brief autobiographical sketch.

[7] In 2011, the YWCA of Rhode Island created the Isabelle Ahearn O’Neill Award in her memory to honor the state's women leaders.