| W. H. Seward Thomson | |
| Office: | Senior Judge of the United States District Court for the Western District of Pennsylvania |
| Term Start: | February 21, 1928 |
| Term End: | November 29, 1932 |
| Office1: | Judge of the United States District Court for the Western District of Pennsylvania |
| Term Start1: | July 21, 1914 |
| Term End1: | February 21, 1928 |
| Appointer1: | Woodrow Wilson |
| Predecessor1: | James Scott Young |
| Successor1: | Nelson McVicar |
| Birth Name: | W. H. Seward Thomson |
| Birth Date: | 16 December 1856 |
| Birth Place: | Beaver County, Pennsylvania |
| Education: | Marshall College read law |
W. H. Seward Thomson (December 16, 1856 – November 29, 1932) was a United States district judge of the United States District Court for the Western District of Pennsylvania.
Born in Beaver County, Pennsylvania, Thomson attended Washington and Jefferson College, and Marshall College (now Marshall University) in Huntington, West Virginia before reading law to enter the bar in 1880. He was in private practice in Beaver, Pennsylvania from 1881 to 1894, and then in Pittsburgh, Pennsylvania until 1914.
On July 7, 1914, Thomson was nominated by President Woodrow Wilson to a seat on the United States District Court for the Western District of Pennsylvania vacated by Judge James Scott Young. Thomson was confirmed by the United States Senate on July 21, 1914, and received his commission the same day. He assumed senior status on February 21, 1928, serving in that capacity until his death on November 29, 1932.