| St. Mark's School of Texas | |
|---|---|
 | |
| Address | |
 | |
10600 Preston Road , 75230 | |
| Coordinates | 32°53′25″N 96°48′03″W / 32.890363°N 96.800762°W |
| Information | |
| Type | Private, day, college-prep boys' school |
| Motto | Courage and Honor |
| Established | 1906 |
| Headmaster | David W. Dini |
| Faculty | 97 full-time teachers |
| Grades | 1–12 |
| Gender | All-boys |
| Number of students | 917 |
| Campus size | 42 acres (17 ha) |
| Color(s) | Blue & Gold |
| Athletics conference | SPC |
| Mascot | Lion |
| Accreditation | ISAS |
| Endowment | $181 million (June 30, 2024) |
| Tuition | $34,305 (average) |
| Website | smtexas |
The St. Mark's School of Texas is a private, nonsectarian, college-preparatory day school in Dallas, Texas. Established in 1906, St. Mark's educates roughly 900 boys in grades 1-12.
St. Mark's is one of the wealthiest day schools in the United States. The school's financial endowment stands at nearly $181 million as of June 30, 2024. 14.7% of students are on financial aid, and students with family incomes under $140,000 receive scholarships worth, on average, 90% of tuition.