Marktkirche is the main Protestant church in Wiesbaden, the state capital of Hesse, Germany. The neo-Gothic church on the central Schlossplatz was designed by Carl Boos and built between 1853 and 1862. At the time it was the largest brick building of the Duchy of Nassau. It is also called Nassauer Landesdom.

Wiesbaden is the capital of the German state of Hesse, and the second-largest Hessian city after Frankfurt am Main. With around 283,000 inhabitants, it is Germany's 24th-largest city. Wiesbaden forms a conurbation with a population of around 500,000 with the neighbouring city of Mainz. This conurbation is in turn embedded in the Rhine-Main Metropolitan Region—Germany's second-largest metropolitan region after Rhine-Ruhr—which also includes the nearby cities of Frankfurt am Main, Darmstadt, Offenbach am Main, and Hanau, and has a combined population exceeding 5.8 million.