| John W. Farrelly | |
| State1: | Pennsylvania |
| District1: | 22nd |
| Term Start1: | March 4, 1847 |
| Term End1: | March 3, 1849 |
| Preceded1: | William Swan Garvin |
| Succeeded1: | John W. Howe |
| Office2: | Member of the Pennsylvania House of Representatives |
| Term2: | 1837 |
| Office3: | Member of the Pennsylvania Senate for the 21st district |
| Term3: | 1841-1842 |
| Office4: | Member of the Pennsylvania Senate for the 26th district |
| Term4: | 1843-1844 |
| Birth Date: | 7 July 1809 |
| Birth Place: | Meadville, Pennsylvania, US |
| Death Place: | Meadville, Pennsylvania, US |
| Party: | Whig |
John Wilson Farrelly (July 7, 1809 – December 20, 1860) was an American politician from Pennsylvania who served as a Whig member of the U.S. House of Representatives for Pennsylvania's 22nd congressional district from 1847 to 1849.
John Wilson Farrelly (son of Patrick Farrelly) was born in Meadville, Pennsylvania. He received a limited schooling and graduated from Allegheny College at Meadville in 1826. He studied law, was admitted to the bar in 1828 and commenced practice in Meadville. He served as a member of the Pennsylvania House of Representatives in 1837. He served as a member of the Pennsylvania State Senate for the 21st district from 1841 to 1842 and for the 26th district from 1843 to 1844.[1]
Farrelly was elected as a Whig to the Thirtieth Congress. He served as chairman of the United States House Committee on Patents during the Thirtieth Congress. He was not a candidate for renomination in 1848. He was appointed Sixth Auditor of the Treasury by President Zachary Taylor and served from November 5, 1849, until April 9, 1853, when he resigned. He engaged in the practice of law in Meadville until his death in 1860.
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