| Mullen High School | |
|---|---|
| Address | |
 | |
3601 South Lowell Boulevard , Colorado 80236 United States | |
| Coordinates | 39°39′02″N 105°02′11″W / 39.650626°N 105.036278°W |
| Information | |
| Type | Private, Co-Educational |
| Motto | Enter to Learn, Leave to Serve |
| Religious affiliation(s) | Catholic Church |
| Established | 1931 |
| CEEB code | 060600 |
| President | Raul Cardenas |
| Principal | Sam Govea |
| Staff | 160 |
| Faculty | 92 |
| Grades | 9–12 |
| Enrollment | 725 |
| Student to teacher ratio | 12:1 |
| Campus size | 39 acres (160,000 m2) |
| Campus type | Urban |
| Color(s) | Navy blue and gold |
| Athletics conference | CHSAA |
| Sports | 27 |
| Mascot | Mustangs |
| Accreditation | COGNIA |
| Tuition | $19,300 |
| Website | www |
Mullen High School (formerly J.K. Mullen High School) is a Roman Catholic, Brothers of the Christian Schools, college-preparatory high school in Denver, Colorado.