John Edward Charles O'Sullivan Addicks (November 21, 1841 – August 7, 1919) was an American industrialist and capitalist who used his wealth from financing and building gas works to wage four unsuccessful campaigns for a United States Senate seat in Delaware.

He graduated from Philadelphia public schools at age 15 and entered business, first in wholesale dry goods, then in flour, and later in real estate.

Laura and Rosalie are buried in the Butcher family plot at Laurel Hill Cemetery, Section K, lot 76.

[5] Addicks was a candidate in 1895 for one of Delaware's United States Senate seats and, although he himself failed of election, was able to prevent that of his rival, Henry A. du Pont.

William T. Watson, the ex-speaker of the state House, having become governor through the death of Joshua H. Marvil, was permitted to cast a ballot in the legislative convention, and an opportunity was thus obtained for contesting the election of du Pont, whom the Democrats and Populists refused to seat.