Thelma Wright Babbitt (October 9, 1906 – February 18, 2004) was an American civil rights and environmental activist, best known for her work with the League of Women Voters and the American Friends Service Committee in the 1950s and 1960s, and with the Sierra Club and the Harris Center in the 1970s and later.

"The success of a democracy depends on the individual being active and understanding and assuming his responsibility," she noted in a 1951 interview.

[9] In 1973, she toured South America in a group of twenty American women activists, and met Isabel Peron.

[10] Babbitt founded a chapter of the Sierra Club for Southern New Hampshire, and served on its board of trustees.

[11] In 1977, she chaired the Sierra Club's North East Regional Conservation Committee task force, to oppose construction of a new highway across New Hampshire and Vermont.