Sidney Dean (November 16, 1818 – October 29, 1901) was a United States representative from Connecticut.

He was born in Glastonbury, Connecticut where he attended the common schools and Wilbraham and Suffield Academies.

He was a minister in the Methodist Episcopal Church from 1843 to 1853, when he retired from the ministry because of impaired health.

After leaving the ministry, he engaged in manufacturing in Putnam, Connecticut.

He died in Brookline, Massachusetts in 1901 and was buried in South Cemetery, Warren, Rhode Island.