Holy Cross Sanctuary in Braniewo, Baroque church in Braniewo, Poland.

The Holy Cross Sanctuary is a Baroque church built on a Greek cross plan with a dome over the crossing. It is a brick structure covered with plaster, and its facades are decorated with niches holding statues. Inside, pilasters divide the walls and support the entablature; the barrel vaults of the arms carry gilded stucco decoration, and the dome's cupola holds a polychrome painted in 1951. Two sacristies with groin vaults flank the presbytery.

The present brick church was approved by Warmian bishop Teodor Andrzej Potocki in 1722; its cornerstone was laid on 1 July 1723 and it was consecrated on 2 September 1731 by auxiliary bishop Michał Remigiusz Łaszewski. The dome was completed only in 1742. It replaced earlier wooden chapels that burned after lightning strikes, and the miraculous Trinity image painted by Lorenz Maaß in 1625 was solemnly installed in 1672.

The name refers to the relic of the Holy Cross, and since 9 September 2009 the church has held the status of Archdiocesan Sanctuary of the Holy Cross. The main altar, made in 1738 in the Reszel workshop of Jan Christian Schmidt, holds the 1625 Throne of Grace painting by Lorenz Maaß, with a figure of Saint John Nepomucene, the second patron, above it. The side altars, from the first half of the 18th century, are dedicated to Our Lady of Sorrows and Saint Valentine.

The church stands on a Greek cross plan with a dome over the crossing, so the interior is best read from the centre; two sacristies with groin vaults flank the presbytery. The Redemptorists, who took over in 1923 and again after 1945, built the adjoining monastery in a style echoing the church. The building is entered on the municipal monument register.

The church walls are plastered, not exposed brick, and the Redemptorists took over in 1923, building their monastery in a style echoing the church. The dome was finished only in 1742, eleven years after consecration. Inside, glass paintings in the inner portal show the Finding and Exaltation of the Holy Cross.