| John B. D. Cogswell | |
| Order: | 50th |
| Office: | President of the Massachusetts Senate |
| Term Start: | January 3, 1877 |
| Term End: | January 7, 1880 |
| Predecessor: | George B. Loring |
| Successor: | Robert R. Bishop |
| State1: | Massachusetts |
| State Senate1: | Massachusetts |
| District1: | Cape |
| Term Start1: | January 3, 1877 |
| Term End1: | January 7, 1880 |
| Predecessor1: | Jonathan Higgins |
| Successor1: | Samuel Snow |
| State House2: | Massachusetts |
| District2: | Barnstable 1st |
| Term Start2: | January 4, 1871 |
| Term End2: | January 7, 1874 |
| Alongside2: | ,,, |
| Predecessor2: | Francis A. Nye,, |
| Successor2: | Levi L. Goodspeed,, |
| Office3: | United States Attorney for the |
| Appointer3: | Abraham Lincoln |
| Term Start3: | 1861 |
| Term End3: | 1866 |
| Predecessor3: | Don A. J. Upham |
| State House4: | Massachusetts |
| District4: | Worcester |
| Term Start4: | January 7, 1857 |
| Term End4: | January 6, 1858 |
| Alongside4: | William T. Merrifield,,, |
| Predecessor4: | Harrison Bliss,,,, |
| Successor4: | Albert L. Benchley,,, |
| Party: | Republican |
| Birth Name: | John Bear Doane Cogswell |
| Birth Date: | 6 June 1829 |
| Birth Place: | Yarmouth, Massachusetts |
| Restingplace: | Ancient Cemetery Yarmouth Port, Massachusetts |
| Profession: | Lawyer, author |
John Bear Doane Cogswell (June 6, 1829June 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.
In 1847, while at Dartmouth College he became a member of Zeta Chapter of Psi Upsilon Fraternity.[1] In 1852, he was awarded the LL B. from Harvard Law School.[2]