The man was left injured following the attack in Wood Green Road just before 1am on Tuesday.
He was stabbed in the leg and given trauma care by paramedics at the scene, before being taken to hospital.
A spokesman for West Midlands Police said: "We were called following reports of disorder in Wood Green Road, Wednesbury, just before 1am on Tuesday.
"A man in his 20s was taken to hospital with a stab wound to his leg which was not serious."
"Enquiries to establish who was responsible are continuing and anyone with information is asked to contact us."
Anyone with information is asked to call police on 101, quoting crime reference number 20/170994/21.
Alternatively, contact Crimestoppers anonymously on 0800 555111 or at crimestoppers-uk.org