Lilian Carpenter Streeter (July 22, 1854 – March 29, 1935) was an American social reformer, organizational founder, clubwoman, and author.

Having lived in Concord, New Hampshire from 1877 till her death, she was active in every social, educational, and philanthropic movement that was brought to her notice, and her actions commanded the support and cooperation of other women.

[1] At the National Conference of Charities and Correction, held in Baltimore, Maryland, 1915, Streeter gave a paper entitled, "The Relation of Mental Defect to the Neglected, Dependent, and Delinquent Children of New Hampshire", making her the first woman to give a paper of this kind at a national conference.

[2] She was a descendant of William Carpenter, founder of Rehoboth, Massachusetts, and Col. Samuel Partridge, Chief Justice.

[6] One of the first things Streeter succeeded in accomplishing, after the founding of the Woman's Club, was the organizing of the Charities of Concord.

At the close of the address a committee of five, with Streeter as chairman, was appointed to see about forming a Charities Organization Society in Concord.

She served as chair, New Hampshire Children's Commission, 1913–15, her report having been called for from all over the country by social workers and state and college libraries.

[2] At the National Conference of Charities and Corrections, held in Baltimore, May 12, 1915, Streeter gave a paper entitled, "The Relation of Mental Defect to the Neglected, Dependent, and Delinquent Children of New Hampshire".

[3] She was a representative from New Hampshire at the White House Conference on Children and Youth, January 1909, on call of President Theodore Roosevelt.