Completed in the late 14th century in a Brick Gothic style, the present church comprises Mannerist-Baroque architectural elements.

The paintings in the altars, presbytery and main nave were made by the famous 17th- century artists: Herman Han (1574–1628), Adolf Boy (1612-1680), Andrzej Stech (1635–1697) and Andreas Schlütera (1660–1714).

The interior also holds Rococo chapels of the Holy Cross and St John of Nepomuk, an ambo, tombstones, epitaphs, the Pomeranian Dukes tomb, the Kos family tomb, bishop's crypt, antique chandeliers, canopies, and many other antiquities, including a feretory of great cultural value, showing Our Lady of Oliwa with an Infant Jesus.

The archcathedral holds organ concerts all year round and the beautifully restored monastery (now belonging to Gdańsk Seminary) displays the collection of the Diocesan Museum.

The famous great Oliwa organ was designed and constructed between the years 1763 and 1788 by Johann Wilhelm Wulff (Brother Michael, a Cistercian Monk).

The organ front was decorated with Rococo sculptures and moveable angels holding bells, trumpets, stars and suns.

Between 1790 and 1793, by order of the new Abbot of Oliwa, a widely known Gdańsk organ master, Friedrich Rudolf Dalitz, undertook the difficult task of moving the console from the middle to the north wing of the matroneum, which was extremely complicated owing to the size of the instrument and the complexity of the tracker action system.

He introduced a new disposition, added several missing pipes and a newly built positive, placed in the third arc in the west of the nave.

Today the great Oliwa organ comprises 96 registers, 5 manuals, a pedal, an electro-pneumatic tracker action and also an electronic system recording up to 64 combinations (so-called Setzer type).

In 1902 Berlin based company of brothers Oswald and Paul Dinse carried out further reconstruction of the organ, introducing a pneumatic tracker action and reducing the number of registers to 14 (2 manuals and a pedal).