| William B. Byrnes | |
| State Delegate: | Maryland |
| District: | 1B |
| Term Start: | 1975 |
| Term End: | 1986 |
| Alongside: | W. Timothy Finan |
| Predecessor: | district established |
| Successor: | Kevin Kelly |
| Office1: | Member of the Maryland House of Delegates |
| Constituency1: | Allegany County, Maryland |
| Term Start1: | 1971 |
| Term End1: | 1974 |
| Predecessor1: | Edward T. Evans Jr. |
| Successor1: | districts established |
| Birth Date: | 31 May 1906 |
| Birth Place: | Eckhart Mines, Maryland, U.S. |
| Death Place: | Cumberland, Maryland, U.S. |
| Resting Place: | St. Michael's Church Frostburg, Maryland, U.S. |
| Party: | Democratic |
| Alma Mater: | State Teachers College at Frostburg |
| Allegiance: |  United States |
| Battles: | World War II |
William B. Byrnes (May 31, 1906 – February 26, 1989) was an American politician. He served in the Maryland House of Delegates, representing Allegany County from 1971 to 1974 and District 1B from 1975 to 1986.
William B. Byrnes was born on May 31, 1906, in Eckhart Mines, Maryland. He attended parochial and public schools in Allegany County. He graduated from State Teachers College at Frostburg in 1926.[1] [2]
Byrnes worked as an inspector for the Maryland Motor Vehicle Administration and as a sales manager for W. K. Kellogg Company. He also worked as a teacher. He served in the U.S. Army during World War II.[1] [3]
Byrnes became a member of the Maryland House of Delegates in 1971 and represented Allegany County from 1971 to 1974 and District 1B from 1975 to 1986. He was a Democrat.[1] [4] [5] During his career, he turned down donations and self-funded his political campaigns.[3]
Byrnes owned his family's hardware store in Frostburg, Maryland until the early 1980s.[6]
Byrnes died on February 26, 1989, at Sacred Heart Hospital in Cumberland, Maryland. He was buried in the parish cemetery at St. Michael's Church in Frostburg.[2]