MJ may refer to:
Mj Rodriguez (born January 7, 1991; sometimes capitalized as MJ Rodriguez) is an American actress and singer.
Mary "MJ" Jennings Hegar (née von Stein; born 1976) is an American Air Force veteran, businesswoman, and teacher.
Mjolnir () is a fictional mythical weapon appearing in American comic books published by Marvel Comics.
Mjøsa is Norway's largest lake, as well as one of the deepest lakes in Norway and in Europe. It is the fourth-deepest lake in Norway.
Mjini Magharibi Region (also known as the Zanzibar Urban West Region) is one of the 31 regions of Tanzania.
mjunction services limited is a 50:50 joint venture of two Indian steel conglomerate – the Steel Authority of India Ltd (SAIL) and Tata Steel.
Monique Jacqueline Williams-Jenkins is an American professional wrestler currently signed to WWE performing in their developmental territory NXT.