Ioan Campeanu, 43, was arrested after allegedly killing Andra Hilitanu at a property in Neasden Lane, Brent, north-west London, in the early hours of Friday.
Campeanu, of Neasden Lane, has been remanded in custody and is set to appear at Willesden Magistrates’ Court on Monday.
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Formal identification is yet to take place, but the victim is believed to be Ms Hilitanu.
Officers have confirmed that the suspect and victim were known to each other, and the Met Police are not seeking any other people in connection with the death.
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A post-mortem that took place at Northwick Park Hospital on Saturday gave a provisional cause of death as a stab wound to the neck.
Ms Hilitanu’s family have been informed, Scotland Yard said.