["Journal of School Health, Volume 96, Issue 10, October 2026. ", "\nABSTRACT\n\nBackground\nCentral to student learning and academic success, school engagement of immigrant children also reflects their adaptation to a primary institution in their new country. This study aims to characterize the mental health and well‐being of immigrant and native students from lower and upper secondary education in Portugal (Grades 5–12).\n\nMethods\nOnline survey conducted between January and June 2024 among 3073 public school students from Grades 5 to 12.\n\nResults\nCompared to Portuguese students, immigrant students have significantly higher odds of poor psychological well‐being (24.7% vs. 37.8%, respectively, p < 0.001; adjusted odds ratio = 1.67, p = 0.002). Main associated factors included poor peer relationships, lack of school belonging, low self‐esteem, weak teacher support, and negative perceptions of the school climate.\n\nImplications for School Health Policy, Practice, and Equity\nTeacher preparation and capacity‐building programs that focus on working and communicating with immigrant students and their families can play a vital role in more equitable, inclusive, and effective educational practices for all students.\n\nConclusions\nThe findings highlight the need to develop awareness and policy strategies, involving all actors in the school environment, for promoting and supporting positive mental health outcomes and fostering a greater sense of belonging among all students, regardless of their immigrant status.\n"]