Certainly, Monster Manual, page 245, emphasis added:
"Orc Crossbreeds. Luthic, the orc goddess of fertility and wife of Gruumsh, demands that orcs procreate often and indiscriminately so that orc hordes swell generation after generation. The orcs' drive to reproduce runs stronger than any other humanoid race, and they readily Crossbreeds with other races. When an orc procreates with a non-orc humanoid of similar size and stature (such as a human or a dwarf), the resulting child is either an orc or a half-orc. When an orc produces young with an ogre, the child is a half-ogre of intimidating strength and brutish features called an ogrillon."
So, when making a Half-Orc, any humanoid parent is viable, with dwarves singled out as an example.