Marietta College is a co-educational private college in Marietta, Ohio, United States, which was the first permanent settlement of the Northwest Territory. The school offers 43 majors along with a large number of minors, all of which are grounded in a strong liberal arts foundation. The school encompasses approximately three city blocks in downtown Marietta and enrolls about 1,400 full-time students each year. It is known for its Petroleum Engineering, Athletic Training and McDonough Leadership programs.

Marietta College is one of America's 37 "Revolutionary Colleges," institutions with origins reaching back to the 18th century. Originally founded as the Muskingum Academy in 1797, today's College was chartered in 1835. In 1860, Marietta became the sixteenth college awarded a chapter of Phi Beta Kappa, the world's oldest honorary society.

The athletic department sponsors 18 varsity sports that compete in NCAA Division III and the Ohio Athletic Conference. The college’s baseball team won the fourth Division III College World Series Championship in school history in 2006. The college also sponsors intramural and recreation program, which are housed in the Dyson Baudo Recreation Center.

The majority of the students at the college are from Ohio, Pennsylvania and West Virginia, but a sizable portion of the student population is from the New England states.