Mărgineni () is a commune in Bacău County, Western Moldavia, Romania. It is composed of eight villages: Barați (Barát), Luncani (Lunkány), Mărgineni, Pădureni, Podiș, Poiana, Trebeș (Terebes), and Valea Budului.

At the 2002 census, the commune had 8,132 inhabitants, 99.8% of which were ethnic Romanians; 57.5% were Roman Catholic and 41.9% Romanian Orthodox. At the 2011 census, the population had decreased to 7,993, while at the 2021 census, it had increased to 9,594.

Natives Constantin Cândea (1887 – 1971), chemist, Rector of the Polytechnic University of Timișoara Ioan Măric (born 1945 in Luncani), painter Alexandru Piru (1917 – 1993), literary critic and historian

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