John Bear Doane Cogswell (June 6, 1829 – June 11, 1889) was an American lawyer and Republican politician from the U.S. state of Massachusetts.

He was President of the Massachusetts Senate for the 1877, 1878, and 1879 sessions, and was United States Attorney for the District of Wisconsin during the presidency of Abraham Lincoln.

He was the last U.S. Attorney for Wisconsin before its division into Western and Eastern districts.

[1][2] In 1847, while at Dartmouth College he became a member of Zeta chapter of Psi Upsilon fraternity.

[3] In 1852, he was awarded the LL B. from Harvard Law School.