Following an incident in Edgecombe Road in Barton at around 11.35pm on February 29, a man in his 20s suffered several stab wounds.
He was taken to hospital and following treatment, he has now been discharged.
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On Monday (March 4), police arrested a 15-year-old boy from Headington on suspicion of attempted murder.
He has since been released on conditional police bail while the investigation continues.
Another man, aged 26 and from Oxford, who was arrested on suspicion of wounding with intent and resisting a constable has since been released on police bail.
Detective Inspector Krista Thompson of Oxford CID said: “Thankfully, the victim’s condition was not life-threatening and he has now been discharged from hospital.
“We have made a further arrest in connection with this incident and I would like to reassure the community that we are making good progress with the investigation.
“I would again ask anybody who believes they witnessed the incident or who has any information that may assist the investigation to please contact us.”
Anybody who witnessed the incident or who has any information that may assist the investigation should contact police on 101, quoting reference 43240096926 or by calling Crimestoppers anonymously on 0800 555 111.