Isaac Fletcher (November 22, 1784 – October 19, 1842) was an American lawyer and politician.

[2] He pursued classical studies, and graduated with honors from Dartmouth College in Hanover, New Hampshire, in 1808.

Among the prospective attorneys who studied under Fletcher were Thomas J. D. Fuller and Thomas Bartlett Jr.[4] He was a member of the Vermont House of Representatives for several terms between 1819 and 1825, and served as Speaker from 1824 to 1825.

[6] He was military aide to Governor Richard Skinner, and served as Adjutant General of the State Militia from 1824 until 1833.

[10] Fletcher's health declined rapidly during his final term in Congress, which was attributed by doctors to overwork.