The Trinity High School football team has won the Texas 5A Division 1 State Championship three times (2005, 2007, 2009).

[5] In 2017, the school was rated "Met Standard" by the Texas Education Agency, with a 5-Star Distinction for Academic Achievements in ELA/Reading, Mathematics, Science, Social Studies, and Post Secondary Readiness.

The Trinity campus sits on a hillside in west central Euless, less than 500 feet from the Euless-Bedford city limit.

[7] Trinity High School is made up of eleven distinct buildings, most of which are named for the department they house (often abbreviated to just the first letter).

The two-story N-Building lies on the campus's southern edge and houses the Foreign Language Department and many classes of and the office of the coordinator of the International Baccalaureate program.

[6] Euless is home to one of the largest Tongan populations outside of Tonga; the school is known for welcoming and celebrating students from diverse backgrounds.

[10][11][12][13] One of the school's most visible cultural celebrations is the varsity football team's performance of the Sipi Tau before and after each game.

Students in the attendance zones for Bell Manor, Lakewood, Meadow Creek, Midway Park, North Euless, Oakwood Terrace, Shady Brook, South Euless, Spring Garden, Viridian, and Wilshire elementary schools attend Trinity High School.

In 2017, they resumed membership in Bands of America and participated in the Super-Regional Championship in Atlanta at the new Mercedes-Benz Stadium, where they placed 15th.

In 2007, the Trinity High School Choirs won 10 out of the 11 awards at the Disney Festival and received Sweepstakes ratings in the UIL Competition.

The show choir, Harmony, is a 14-16 member auditioned ensemble and perform throughout the Metroplex including places such as The Mansion on Turtle Creek, the Nationalization Ceremony for immigrants, and the Ft. Worth Petroleum Club.

They received the All-American rating with 5 marks of Distinction from the National Press Association, the NSPA's highest ranking.

[34] Formerly called Trojan Men, the now co-educational Trojan Crew waves the schools banner during football games, the school scores a touchdown, the Crew runs the letter flags and Nike flags down the field in support, raising the spirits of the players and the student section.