A 31-year-old woman was robbed as she walked along Kersington Crescent, Cowley, on Sunday night.
She was grabbed from behind by a man who forced her to hand over £70 in cash just before 10pm.
The robber, who was described as white and aged about 45, fled in the direction of Barns Road.
He was about 6ft 1ins tall, of medium build, and was wearing a white or grey long-sleeved shirt. He was clean shaven and spoke with a southern accent.
Anyone with information can call Det Con Rich Allmond on 08458 505505.
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