The brawl broke out at the Lawnswood Arms in Adel yesterday evening, when the group were attending a private event.
Residents fear over six-lane junction plans at Lawnswood roundaboutOne man was stabbed in the arm and another sustained cuts when he tried to intervene.
West Yorkshire Police said:
"At 6.13pm last night, police were called to an incident at the Lawnswood Arms public house on Otley Road, Adel.
"A 46-year-old man had received a stab wound to his arm during an altercation with another man.
"A 42-year-old man had also received a cut to his arm when he intervened. Both injured men were taken to hospital for treatment and later released.
"A 24-year-old man was arrested nearby on suspicion of wounding. He remains in custody.
"All those involved were part of an extended family group. A scene has been cordoned off near to the pub to undergo a search this morning."