Silas Comfort Swallow (March 5, 1839 – August 13, 1930) was a United States Methodist preacher and prohibitionist politician who was a lifelong opponent of slavery.

He was named after Methodist preacher Silas Comfort (1803–1868), an anti-slavery member of the Genesee, Oneida and Missouri Conferences.

In 1862, he enlisted into the Union Army and served as a First lieutenant in the 18th Pennsylvania Volunteer Infantry Regiment during the American Civil War.

[9] Swallow, who was supposed to serve as an at-large delegate for Pennsylvania, but was unable to attend due to his wife's poor health, was voted on instead and given the nomination by acclamation.

Upon reaching his 70th birthday in 1909, he published a 482-page hardback autobiography: III Score and X – Selections, Collections, Recollections of Seventy Busy Years.

This proved to be so successful that he came out with periodic updates as follows: Other booklets and pamphlets by Swallow, all of which are preserved in the archives of the Central Pennsylvania Conference of the United Methodist Church, range in date and content from his 1879 Camp Meetings and the Sabbath to his 1917 A Sermon on Thanksgiving and Thanksliving.