Isaac M. Jordan
 Isaac M. Jordan (born Isaac Alfred Jordan; May 5 1835 – December 3 1890) was a United States Congressman born in Mifflinburg Union County Pennsylvania. He served one term elected as a Democrat to the 48th congress (March 4 1883 – March 3 1885) in Ohio's 2nd congressional district a strong Republican district. He was also one of the founding members of the Sigma Chi fraternity.