Joseph Warren Merrill (December 13, 1819 – November 12, 1889) was a Massachusetts politician who served as the Mayor of Cambridge, Massachusetts.

He also served as the Chair of the Colby College Board of Trustees from 1885 until his death in 1889.

[3] J. Warren Merrill was born on December 13, 1819, in South Hampton, New Hampshire, to Nathan and Sally (Page) Merrill.

[3] He married Hannah Brown Wattson in 1848, with whom he had two daughters and four sons.

[4] He died in Cambridge, Massachusetts, on November 12, 1889.