Holy Trinity church in Supraśl, Baroque revival church in Supraśl, Poland

The Holy Trinity Church in Supraśl is a single-nave brick church built in the Neo-Baroque style on a rectangular plan, closed by an altar apse and covered by a gable roof. A tower with a porch, a choir gallery and two sacristies were added in 1902–1903.

In 1849 the tsarist authorities granted permission to build a Catholic church in Supraśl. The church was erected in 1861–1863, funded by local factory owners, and consecrated in 1868. From 1865 it appeared in documents as a chapel, from 1868 it was a filial church of the Białystok parish, and in 1906 it gained parish church rights.

The church was funded by local factory owners and served as a chapel from 1865, then as a filial church of the Białystok parish from 1868; it gained parochial rights in 1906. Its dedication to the Holy Trinity reflects the town's Orthodox heritage, where the nearby monastery also bears the same dedication.

The church stands in Supraśl, in the Podlaskie Voivodeship, and belongs to the Wasilków deanery of the Archdiocese of Białystok. It is one of only two Roman Catholic churches in the town, so it is easily found near the centre. The building is a single-nave rectangle closed by an altar apse, with a two-slope roof.

The tower, porch, choir gallery and two sacristies were added only in 1902–1903, four decades after the church was consecrated in 1868. Until 1906 the building had no parochial rights: from 1865 it appeared in documents as a chapel, and from 1868 it was a filial church of the Białystok parish.