Mark Delahay | |
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| Judge of the United States District Court for the District of Kansas | |
| In office October 6, 1863 – December 12, 1873 | |
| Appointed by | Abraham Lincoln |
| Preceded by | Archibald Williams |
| Succeeded by | Cassius Gaius Foster |
| Personal details | |
| Born | Mark William Delahay 1817 Talbot County, Maryland, U.S. |
| Died | May 8, 1879 (aged 61–62) Kansas City, Kansas, U.S. |
| Political party | Republican |
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.