| David M. Kelly | |
| Order: | 29th |
| Office: | Speaker of the Wisconsin State Assembly |
| Term Start: | January 1879 |
| Term End: | January 1880 |
| Predecessor: | Augustus Barrows |
| Successor: | Alexander A. Arnold |
| State1: | Wisconsin |
| State Senate1: | Wisconsin |
| District1: | 2nd |
| Term Start1: | January 5, 1880 |
| Term End1: | January 2, 1882 |
| Predecessor1: | Thomas R. Hudd |
| Successor1: | Thomas R. Hudd |
| State Assembly2: | Wisconsin |
| District2: | Brown 1st |
| Term Start2: | January 1, 1877 |
| Term End2: | January 5, 1880 |
| Predecessor2: | Mitchell Resch |
| Successor2: | Benjamin Fontaine |
| Party: | Republican |
| Birth Date: | 11 February 1841 |
| Birth Place: | Hamilton, Massachusetts, U.S. |
| Death Date: | after |
| Profession: | Lawyer |
| Allegiance: | United States |
| Branch: | United States Volunteers Union Army |
| Rank: | Quartermaster |
| Battles: | American Civil War |
David Marsh Kelly (February 11, 1841disappeared January 21, 1916) was an American lawyer and Republican politician. He was the 29th speaker of the Wisconsin State Assembly and also served in the Wisconsin State Senate, representing Brown County. He disappeared mysteriously in 1916 and was never heard from again.
Kelly was born on February 11, 1841, in Hamilton, Massachusetts. After serving with the Union Army during the American Civil War, he moved to Appleton, Wisconsin, in 1867 before settling in Green Bay, Wisconsin, the following year.[1]
After having been a member of the Wisconsin State Assembly in 1877 and 1878, Kelly was Speaker of the Assembly in 1879. From 1880 to 1881, he represented the 2nd District in the Senate. He was a Republican.
Kelly returned to Massachusetts in 1884. In February 1916, he was reported to have disappeared, having last been seen on January 21 in his office in Boston, from which he was thought to be taking a train to his home in Sharon, Massachusetts.[2] He was not found despite an intensive search, including hired detectives, and in September of that year members of his Civil War regiment discussed his disappearance at their annual reunion.[3] Linwood Cemetery in Haverhill, Massachusetts, has a cenotaph memorial to Kelly.