Helen Thomas Flexner (August 14, 1871 – April 6, 1956) was an American writer and teacher.

Flexner née Thomas was born on August 14, 1871, in Baltimore, Maryland.

[1] While studying at Bryn Mawr she met Lucy Donnelly with whom she would travel to Europe.

Flexner attended classes at the Collège de France, Leipzig University, and the Sorbonne.

After several years in Europe Flexner prevailed on her sister M. Carey Thomas (1857–1935) for a job teaching at Bryn Mawr.