Dealu is a commune located in Harghita County, Romania. It is situated within the Székely Land, which is an ethno-cultural region found in eastern Transylvania.
The commune is composed of seven distinct villages: Dealu, Fâncel (Székelyfancsal), Sâncrai (Székelyszentkirály), Tămașu (Székelyszenttamás), Tibod (Tibód), Ulcani (Ülke), and Valea Rotundă (Uknyéd).