The fire was reported at 7.53pm at Big T’s Diner at Victoria Street in the town.
Two appliances from Lurgan Fire Station attended the scene along with a crew from Portadown.
A Fire and Rescue service spokesperson said: “Firefighters dealt with a fire in a chip shop diner. The cause of the fire was accidental.
“The incident was dealt with at 9.23pm.”
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SDLP Councillor and Westminster election candidate Declan McAlinden praised the fire service for their quick response.
He said: “Massive thank you to Lurgan Fire Brigade on dealing with a serious fire at a food premises in Lurgan.
“Their quick response no doubt prevented a more serious situation, well done lads.”