Miercurea Nirajului (Hungarian: Nyárádszereda [ˈɲaːraːt.sɛrɛdɒ]) is a town in Mureș County, Romania.

It lies in the Székely Land, an ethno-cultural region in eastern Transylvania.

The following seven villages are administered by the town: Beu (Székelybő), Dumitreștii (Demeterfalva), Lăureni (Kisszentlőrinc), Moșuni (Székelymoson), Șardu Nirajului (Székelysárd), Tâmpa (Székelytompa), and Veța (Vece).

The town is part of the Székely Land region of the historical Transylvania province.

[3] At the 2021 census, Miercurea Nirajului had a population of 5,554; of those, 77.9% were Hungarians, 8.3% Romanians, and 6.46% Roma.