Peter Frederick Rothermel, Jr. (September 27, 1850 – May 26, 1929) was a Pennsylvania lawyer and politician. Rothermel was born in Philadelphia, the son of Peter F. Rothermel, a successful artist, and his wife, Caroline Goodhart. After attending various schools in Europe while his father was employed there, Rothermel graduated from Central High School in Philadelphia in 1867. Following his graduation, Rothermel clerked in the law office of James T. Mitchell, a prominent Philadelphia attorney who would later serve on the Supreme Court of Pennsylvania.