| Henry G. Klinefelter | |
| State: | Wisconsin |
| State Assembly: | Wisconsin |
| District: | Dane 4th |
| Term Start: | January 7, 1889 |
| Term End: | January 5, 1891 |
| Predecessor: | Henry Powell |
| Successor: | William H. Porter |
| Birth Date: | 22 October 1843 |
| Birth Place: | Marion County, Ohio, U.S. |
| Death Place: | Madison, Wisconsin, U.S. |
| Restingplace: | Liberty Prairie Cemetery, |
| Allegiance: | United States |
| Branch: | United States Volunteers Union Army |
| Rank: | 2nd Lieutenant, USV |
| Serviceyears: | 1861 - 1865 |
| Battles: | American Civil War |
Henry Gracely Klinefelter (October 22, 1843March 22, 1910) was an American farmer and Republican politician. He served one term in the Wisconsin State Assembly, representing Dane County.
Born in Marion County, Ohio, Klinefelter went to Mukwonago High School in Mukwonago, Wisconsin. In 1846, Klinefelter settled in the community of Nora, in the town of Cottage Grove, Dane County, Wisconsin Territory. Klinefelter was a farmer and tobacco buyer. During the American Civil War, Klinefelter served in Company D of the 7th Wisconsin Infantry Regiment, a part of the famous Iron Brigade, eventually being promoted to Second Lieutenant of the 51st Wisconsin Volunteer Infantry Regiment shortly before the end of the war. After the death of his first wife, Lydia Hoffman Klinefelter (1849–1871), Klinefelter married Frances A. Devoe (1849–1919) in 1872.[1] Klinefelter served as justice of the peace and a census enumerator, and was a Republican. In 1889, Klinefelter served in the Wisconsin State Assembly.[2] He died in Madison, Wisconsin.[3]