Thomas George Carscallen (April 9, 1842 – March 15, 1917) was an Ontario political figure.
He represented Lennox in the Legislative Assembly of Ontario from 1902 to 1917 as a Conservative member.
He was born in North Fredericksburgh Township, Lennox County, Canada West, the son of Isaac Carscallen.
Carscallen began work as a painter but later became an undertaker in partnership with his brother John.
He was also warden for the United Counties of Lennox and Addington in 1888.