An 'unknown vehicle' was also involved in the collision at the junction with Iffley Turn.
A vehicle and a cyclist collided on the Iffley Road at around 12.45pm on Remembrance Sunday (13th November)
The vehicle was driving towards the city centre and turned onto Iffley Turn when the crash happened.
The cyclist, a man in his thirties, suffered a fractured skull along with other minor cuts and bruises.
He was taken to John Radcliffe Hospital in Oxford for further treatment, but has since been discharged.
Police say the driver stopped at the scene, but no details were obtained.
No arrests have been made.
Investigating officer PC Daniel Surman, based at Cowley police station, said: “I am appealing for the driver or any witnesses to this collision, whereby a cyclist has sustained serious injuries, to please come forward.
“The incident took place on Remembrance Sunday which may make it easier for people to recall.
“Also, I would urge any motorists in the area that have a dash-cam to please check their recordings in case anything significant was caught as it could help our investigation, and then send it to us via this dedicated portal."
Witnesses should call 101 quoting reference number 43220511751.