A man robbed a restaurant in Kingswood at knife-point on Wednesday evening.
Police said the man, whose face was covered, entered the premises in Bringelly Road just after 8pm.
He allegedly threatened a female employee with a knife before taking cash from the register and running away.
No one was hurt during the robbery.
Police are appealing for information and want to speak to a man described as Caucasian in appearance and of average height and build.
Anyone with any information is urged to contact St Marys detectives on 9677 7501 or Crime Stoppers on 1800 333 000.