| State: | Pennsylvania |
| District: | 14th |
| Term Start: | January 3, 1981 |
| Term End: | January 3, 2003 |
| Predecessor: | William S. Moorhead |
| Successor: | Mike Doyle |
| State House2: | Pennsylvania |
| District2: | 22nd |
| Term Start2: | January 5, 1971 |
| Term End2: | November 30, 1972 |
| Predecessor2: | Frank W. O'Brien |
| Successor2: | James A. Romanelli |
| Birth Name: | William Joseph Coyne |
| Birth Date: | 24 August 1936 |
| Birth Place: | Pittsburgh, Pennsylvania, U.S. |
| Death Place: | Pittsburgh, Pennsylvania, U.S. |
| Party: | Democrat |
| Alma Mater: | Robert Morris College |
| Signature: | William J Coyne sig.svg |
William Joseph Coyne (August 24, 1936 – November 3, 2013) was a Democratic member of the United States House of Representatives from Pennsylvania from 1981 to 2003.
Coyne was born in Pittsburgh, Pennsylvania. He graduated from Central Catholic High School in 1954, and received a B.S. in accounting from Robert Morris College.
He served two years in the United States Army from 1955 to 1957. He served as a supply sergeant in Korea. After completing his military service, he set up a private accounting firm.
From 1970 to 1972 he was member of the Pennsylvania House of Representatives, and a member of the Pittsburgh City Council from 1974 to 1980.
Coyne was elected to Congress in 1980, succeeding 24-year incumbent William S. Moorhead in a district taking in most of Pittsburgh. He was reelected ten times, never facing serious opposition. He was a longtime member of the United States House Committee on Ways and Means
In 2002, Coyne's district was combined with the district of Mike Doyle, a somewhat more moderate Democrat. Although the new district contained more of Coyne's territory than Doyle's, Coyne retired to avoid the possibility of two Democratic incumbents facing each other in the primary elections.
Coyne died at the age of 77 on November 3, 2013, two months after falling and sustaining head injuries.[1]