Marienthal may refer to one of the following places:
- Germany
- Marienthal (Geisenheim), a quarter of Geisenheim, Hesse
- Marienthal, Hamburg, a quarter in the Wandsbek borough of Hamburg
- A part of Goosefeld, Schleswig-Holstein
- A part of Zehdenick, Brandenburg
- A part of Viereck, Mecklenburg-Vorpommern
- A part of Rockenhausen, Rhineland-Palatinate
- Zwickau-Marienthal, a part of Zwickau, Saxony
- Luxembourg
- Marienthal, Luxembourg
- Namibia
- Mariental, Namibia
- United States
- Marienthal, Kansas