Joseph Hill Sinex (October 7, 1819 – October 6, 1892) was an American politician from Pennsylvania who served as a member of the Philadelphia City Council in 1861 and as a Republican member of the Pennsylvania House of Representatives for Philadelphia County from 1883 to 1884.

He moved to Philadelphia and married Mary C. Duffield on October 29, 1848.

[2] He was mustered into service as captain of Company D of the Seventeenth Pennsylvania Infantry Regiment in April 1861 and was discharged in August.

He was promoted to lieutenant colonel on July 10, 1864[3] and led 258 men at the Battle of Gettysburg and suffered the loss of 3 soldiers and 16 wounded in that battle.

[2] He died in Philadelphia on October 6, 1892, and was interred at Mount Moriah Cemetery.