Solomon Hillen Jr. (July 10, 1810 – June 26, 1873) was a U.S. Representative from Maryland and mayor of Baltimore. Hillen was born at the family estate, "Hillendale," on Hillen Road north of Baltimore City. He graduated from Georgetown College, studied law, was admitted to the bar, and commenced practice in Baltimore. He served as member of the Maryland House of Delegates from 1834 to 1838. His wife was a daughter of General .