Umm Hiram bint Milhan was one of the companions of Muhammad. She was an Ansariyya.
She was the sister of Umm Sulaym and their house was often visited by the prophet. Her two brothers, Hiram bin Milhan and Salim bin Milhan participated in the Battle of Badr and Uhud. She was married to another companion of the prophet, Ubayda ibn as-Samit. She was also aunt f Anas bin Malik the prophet servant. Ubayda was one of the first Ansari men to take part in the Pledge of Aqabah.