Charles Wadleigh Eldridge (October 16, 1877 – May 15, 1965) was a Massachusetts businessman and politician who served in both branches of the Massachusetts legislature as a member of the Board of Aldermen and as the seventeenth Mayor of Somerville, Massachusetts. Eldridge was a delegate to the 1920 Republican National Convention. In addition to his duties as an officeholder, starting in 1893, Eldridge worked as a salesman for Chase & Sanborn.