William H. Koontz
Member of the U.S. House of Representatives from Pennsylvania's 16th district
In office July 18, 1866 – March 3, 1869
Preceded by	Alexander H. Coffroth
Succeeded by	John Cessna
Member of the Pennsylvania House of Representatives
In office 1899-1902
Personal details
Born	(1830-07-15)July 15, 1830 Somerset, Pennsylvania, U.S.
Died	July 4, 1911(1911-07-04) (aged 80) Somerset, Pennsylvania, U.S.
Political party	Republican

William Henry Koontz (July 15, 1830 – July 4, 1911) was a Republican member of the U.S. House of Representatives from Pennsylvania.

Koontz was born in Somerset, Pennsylvania. He completed preparatory studies, studied law, was admitted to the bar in 1851 and commenced practice in Somerset. He was district attorney for Somerset County, Pennsylvania, from 1853 to 1856. He was a delegate to the 1860 Republican National Convention. He served as prothonotary and clerk of the county court from 1861 to 1868.

He successfully contested as a Republican the election of Alexander H. Coffroth to the Thirty-ninth Congress. He was reelected to the Fortieth Congress. He was not a candidate for renomination in 1868. He resumed the practice of law at Somerset and served as counsel for the Baltimore and Ohio Railroad. He was a member of the Pennsylvania House of Representatives from 1899 to 1902. He died in Somerset in 1911. Interment in Union Cemetery.

• United States Congress. "William H. Koontz (id: K000311)". Biographical Directory of the United States Congress.
• The Political Graveyard