The bronze baptismal font (Taufe) by dates back to 1344 and is the oldest artwork in the church. It is regarded as one of the best medieval bronzes in northern Germany. He created it after the Wismar Taufe of 1331 and the Lübeck Taufe of 1337.Klaus Thiede: St. Nikolai in Kiel. Mühlau, Kiel 1960, pp. 8–12 The Erzväteraltar (Altar of the patriarchs) from 1460 was made for the church of the , and was moved to St. Nikolai in 1541 when the monastery was dissolved in the Reformation. The large Triumphkreuz (Triumphal cross) dates back to 1490. The Baroque pulpit is a woodcarving by from 1705. It was a donation by Henning von Wedderkop to replace a 1522 pulpit. The church holds the oldest in Germany, from 1947.
