St. Mark's School of Texas is a 1-12 nonsectarian private preparatory day school in Dallas, Texas. St. Mark's is coached by Paul Mlakarat the High School level and Rebecca Jenkins at the Middle School level. They won the 2017 SSNCT Private/Charter division, finished tied for 21st at the 2011 HSNCT and 2015 HSNCT and tied for 13th at the 2016 HSNCT. St. Mark's placed third at the TQBA State Championship in 2010, 2011 and 2013, second in 2012, and won in 2017. They have hosted the St. Mark's Invitational since at least 2009. Their middle school team has participated in the MSNCT since 2013, gaining 2nd place at the 2014 MSNCT. The middle school team placed third at the 2016 TQBA Middle School State Championship and won in 2017.