The red-rose flag will be flown proudly outside Accrington Town Hall for the first time as part of this year’s Lancashire Day celebrations.
The flag which bears the red rose of Lancashire on a gold background, will be flown at various locations throughout the borough on Sunday, November 27.
Conservative group leader Coun Peter Britcliffe wrote to Hyndburn council to see if the flag could be flown.
He said: "I am delighted that the council has agreed to my request to fly the Lancashire flag.
"It is so important to celebrate our Lancashire roots. This is a great county and really good news at a time when we have won our first cricket county championship for 77 years."
It is not known whether the flag has ever been officially flown in Hyndburn.
Council leader Coun Miles Parkinson added: "It is important to celebrate the palatine that is Lancashire which has been in existence for more than 1,000 years.
"It is important to celebrate our county which is a great county and its rich history."
The traditional Lancashire flag, a red rose on a white field, was never officially registered.
When an attempt was made to register it with the Flag Institute it was found that this flag had already been officially registered by the town of Montrose, Scotland, several hundred years earlier.
As the Flag Institute will not register two flags of the same design, within the UK, Lancashire’s official flag is now registered as a red rose on a gold field, but it does not stop Lancashire folk flying the red rose on a white field to celebrate the county.