Trinity Independent School District is a public school district based in Trinity, Texas, United States; a portion of the district extends into northern Walker County.
In 2009, the school district was rated "academically acceptable" by the Texas Education Agency.
Trinity ISD is a public, K-12 school district located approximately northeast of Houston, Texas, and encompasses a geographic area of . The district serves approximately 1174 students (as of Fall 2006), and shows a slow growth in enrollment over the past decade.