William Mason High School, also known as Mason High School (WMHS or MHS), is a four-year public high school located in the Mason City Schools district in Mason, Ohio, a suburb of Cincinnati, Ohio.

Mason High School's first commencement was held May 21, 1886, at the Mason Presbyterian Church. The seven graduates completed the three-year high school program and each read their topic paper at the graduation ceremony. Professor Louis Coleman was the school superintendent and possibly the only teacher in the high school.^[2]

The current Mason High School facility opened for the 2002-03 school year with 379,000 square feet on a 73-acre campus.^[3] In 2009, a $30 million expansion project added 49 classrooms in two new, three-story wings.^[4] Opened in 2003, and connected to the high school, is the 149,000 square-foot Mason Community Center, which features an Olympic-sized competition swimming pool, therapy pools, six basketball courts, fitness rooms and exercise equipment. It was a joint project of the City of Mason and Mason City Schools.^[5][6]

As of the 2020-21 school year, Mason High School's enrollment is 3,507 students.^[7] It is the largest high school by enrollment in the state of Ohio.^[8]

Mason High School features 27 AP courses, College Credit Plus, a student-run bank, a renowned symphony orchestra,^[9] a speech and debate team, a student-run store, a student-run website, internships, community service, over 70 other school-sanctioned extracurriculars, 67 athletic teams, an award winning marching band, multiple concert bands, jazz band, several concert orchestras, arts, choral and drama programs. Additionally, the award-winning Mason High School Science Olympiad team was ranked first in the nation among all high schools in both 2021 and 2022. ^[7]

The Comets participate in the Greater Miami Conference, in which they have won 15 consecutive All-Sports titles through 2021-22.^[10] Previously, Mason was a charter member of the Fort Ancient Valley Conference from 1965-66 to 2006-07.^[11]

• Angela Bizzarri (class of 2006), NCAA national champion, 9-time All-American cross country and track runner at the University of Illinois^[21]
• Percy Coleman (class of 1894), MLB pitcher^[22]
• Brant Daugherty (class of 2004), actor, Pretty Little Liars, Army Wives, Dancing with the Stars^[23][24]
• Josh Kline (class of 2008), NFL offensive lineman;^[25] member of 2015 Super Bowl-winning New England Patriots^[26]
• Elijah Nkansah (class of 2013), NFL offensive lineman^[27]
• Dan Patrick (class of 1974), sports broadcaster and host, NBC Sports and ESPN,^[28] TV/radio host of The Dan Patrick Show^[29]
• T. J. Zeuch (class of 2013), MLB pitcher