The Parish Church of the Holy Trinity is a Catholic place of worship located in Plaza Escuelas Pías, on the corner with Calle Menéndez y Pelayo, in the urban centre of Castellón de la Plana. It is one of the religious buildings within the city's parish network, with an established presence in the neighbourhood in which it is situated.

The church carries out active parish functions. Its congregation is organised and runs a variety of pastoral activities, including care for the sick and the elderly through volunteer groups linked to the parish.

By typology, the building corresponds to that of an urban parish church of the contemporary period. Precise data on its date of construction and on its predominant architectural style are not available.

The immediate surroundings correspond to a central area of the city, accessible on foot from the historic core. Plaza Escuelas Pías is the main urban landmark for locating the church.

Other churches with the same dedication exist in the province of Valencia, such as those in Casas Altas and Burjassot, so it is advisable to identify precisely the one in Castellón de la Plana.