| Noautocat: | no |
| Conventional Long Name: | Marosszék |
| Common Name: | Marosszék |
| Subdivision: | Seat |
| Nation: | the Székely Land |
| Capital: | Marosvásárhely |
| Today: | Romania |
| Year Start: | 12th century |
| Year End: | 1876 |
| Event Start: | Settlement of the Székelys |
| Event End: | Administrative reform of the Kingdom of Hungary |
| Stat Year1: | 1867 |
| Stat Pop1: | 91,008 |
| Footnotes: | Târgu Mureș is the current name of the capital. |
Marosszék (in Hungarian pronounced as /ˈmɒroʃseːk/) was one of the seats in the historical Székely Land. It was named after the Maros, a river with the biggest discharge in the seat. The composer Zoltán Kodály wrote the Dances of Marosszék (1927, for piano, later orchestrated) based on the folk music of this region.
The religious make-up of Marosszék in 1867 was the following:
48,034
15,697
12,641
7,116
5,520
944
285