McDonogh School is a private, coeducational, PK-12, non-denominational school situated on an 800-acre (320 ha) campus in Owings Mills, Maryland, United States. McDonogh enrolls 1,460 students, approximately 75 of whom participate in the Upper School's five-day boarding program. The school employs approximately 190 full-time faculty members, more than 67% of whom hold advanced degrees and more than 50 of whom live on-campus.

Founded in 1873, McDonogh is regarded as one of the Baltimore region's most prestigious preparatory schools and has been called a "Power School" by Baltimore magazine. The school's students frequently matriculate to Ivy League and other top-ranked colleges and universities. McDonogh's athletic programs have also seen widespread success, particularly in lacrosse, soccer, wrestling, track, and football, where the school's teams have been nationally ranked in recent years.

The school is a member of the Association of Independent Maryland Schools and the National Association of Independent Schools.