Officers were called to the scene at Saville Park in Chapeltown at around 8.18pm on Sunday, June 5 to reports of men and women fighting.
A 30-year-old man had been seriously assaulted on Back Saville Road and was taken to hospital for treatment to head injuries which are not believed to be life threatening.
Three male youths, a man and a woman were arrested on suspicion of violent disorder.
Police are now appealing for anyone with video footage of the fight to come forward.
Detective inspector James Entwistle, of Leeds District CID, said: “Police in Leeds received reports of a fight between a large number of people in Saville Park, Chapeltown.
“Officers attended within minutes and found one person with head injuries and several others with minor injuries.
“Police quickly regained order and five people have been arrested.
“A scene has been established on Back Saville Road and enquiries continue into the incident.
“We believe this was an isolated incident but would appeal for the public’s help and would like to appeal to anyone who has information in relation to the incident to ring Leeds CID.
“We’re particularly interested to hear from anyone who may have filmed what happened on their mobile phones.
“Police have increased patrols in the area to provide reassurance to the community.”
Anyone with information can call Leeds District CID on 101 or Crimestoppers anonymously on 0800 555 111.”