Mark William Delahay (1817 – May 8, 1879) was a United States district judge of the United States District Court for the District of Kansas. He resigned after being impeached by the United States House of Representatives due to allegations of alcoholism.

Mark W. Delahay
Born 1828 in Talbot County, MD
Died 1879 in Kansas City, KS
FJC ID: 598
- Gender
- Male
- Race
- White
Prior employment
- The [Kansas] Territorial RegisterOwner/editor · 1857–present
- Surveyor general of Kansas and Nebraska1861–1863
- Kansas Territorial House of RepresentativesChief clerk · 1860–1861
- Private practice, Leavenworth, Kansas Territory1855–1857
- Private practice, Mobile, Alabama1853–1855
- Private practice, Illinois, -1853
- Virginia [Illinois] ObserverEditor · 1848–1849
Appointments
1864–1873 · Appointed by Abraham Lincoln (Republican)Term ended: Resignation