It ran at one man as he left forcing him to flee back inside.
He expected the animal to wander off but instead it waited at the main door – preventing anyone else from going outside.
When people attempted to leave through another door at the Alconbury Sports and Social Club in Cambridgeshire the fox ran to that instead and acted aggressively.
The Club’s chairman Bruce Staines bravely ventured outside and tried to scare the fox away – only to get chased by it.
One woman attempted to distract it with food so the others could escape and was bitten on the hand.
Another man fell off his bicycle as he was chased by the vicious animal and lost his glasses in the process.
Club members ended up barricaded inside the building and watched the fox on the CCTV system as it stalked outside.
A pest controller was called but when he tried to approach the animal it “went for him” and chased him back to his car.
The animal was eventually caught and destroyed.
Mr Staines said he “tweaked his groin” trying to get away from the marauding animal and back to the safety of the club.
He said he had “never seen anything like it”.
He said: “None of us could get out. When we tried to use a side door, the fox heard and came haring round there.
“Foxes can look very sweet, but as a family-orientated club we had real concerns about this rather vicious animal.
“We have hundreds of children playing in our leagues here.”
He said the pest controller suggested the fox may have been an urban animal, which somehow found itself in the middle of the countryside.
The incident happened on Saturday at 10pm.
Last year a toddler was rushed to hospital after a fox entered his home through a cat flap and attacked him in his bed in south London.
In February 2013, a fox got into the bedroom of a one-month-old baby in Bromley and bit the child’s finger off.