M42 (NGC 1976) is a star forming nebula, an emission and reflection nebula in Orion.
M43 (NGC 1982) is also a star forming nebula and emission and reflection nebula with an open star cluster, also in Orion.
M78 (NGC 2068) is the great star forming nebula, a reflection nebula, with an open star cluster, in Orion.
Mark Bailey