Fire crews from Avon Fire and Rescue were called to an accidental fire at the pub in St Werburghs on Saturday, February 8.
Crews from Temple and Kingswood fire stations were mobilised to reports of a fire at The Farm pub in St Werburghs, which is also used as a residential building.
Once firefighters arrived they found a fire in the rear bedroom of the building and three male casualties.
Firefighters used two breathing apparatus for safety, one high-pressure hose reel and one 45mm jet to put out the fire.
They also used a positive pressure ventilation fan and gas monitor to measure and clear the smoke from the building.
Firefighters then treated the casualties at the scene for smoke inhalation before handing them over to the ambulance service.
Crews then remained on scene and gave fire safety advice to neighbours, including around hoarding.
The cause of the fire is thought to be accidental.
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A spokesperson for The Farm pub said: "The pub was shut for two hours on Saturday to allow firefighters to put out the fire.
"Once the three casualties were treated by firefighters they were taken by the ambulance service and are now fine.
"The only damage to the pub is cosmetic to the upstairs part of the building."
UPDATE: An earlier version of this article said the cause of the fire was deliberate, based on information provided by Avon Fire and Rescue Service. The fire was actually accidental.
