Johann Rasso Januarius Zick (6 February 1730 – 14 November 1797) was a German painter and architect.

Januarius Zick was born in Munich and began to learn his trade from his father, Johannes Zick, a renowned painter himself, to whom he was apprenticed in order to learn how to paint frescoes.

From 1745 to 1748, Januarius Zick was apprenticed as a bricklayer to Jakob Emele in Schussenried.

After 1774, he also designed intarsia paintings for cabinet maker David Roentgen.

From the late 1770s on, Januarius Zick was very active in Upper Swabia, furnishing a number of monastery churches and parish churches with frescoes and altarpieces.