Comissão Técnica de Xadrez is a chess organizer based in Seixal, Portugal. It plays a consistent role in local chess and works closely with municipal structures in the area. Moreover, official Seixal event listings repeatedly identify it as the body responsible for delivering public chess competitions in the municipality.

The organization runs community and competitive events, including rapid chess, open tournaments, school-related chess activities, and commemorative events. It organizes the linked open chess tournament, the 4.º Torneio de Xadrez 25 de Abril, in partnership with Câmara Municipal do Seixal. In addition, official listings connect it with other local events such as anniversary tournaments, Seixal chess circuit competitions, and youth-focused chess activities.

Its work shows a strong grassroots focus while also supporting FIDE-rated tournament play when the format requires it. Furthermore, the organizer helps promote accessible chess competition across Seixal through recurring public events and structured tournament formats. As a result, it contributes to local participation, regular play, and the visibility of organized chess in the region.