Stephanie Brookfield, who is standing for Labour in the Earcroft ward of Darwen in May’s elections, was arrested at Wolverhampton Wanderers’ Molineux stadium on Saturday.
A spokesman for West Midlands Police said: “We can confirm a 50-year-old woman was arrested on suspicion of being drunk and disorderly at Molineux football ground on Saturday.
“She was arrested after complaints from ground staff.
“She was taken to Wolverhampton Police Station, where she was given a caution and released.”
Miss Brookfield, who is active among Rovers fans who have been protesting against owners Venky’s, said: “During the match, a large number of people were protesting against Venky’s.
“Unfortunately, some of them were arrested.
“I am a passionate and vocal Rovers supporter and always have been.
“The police kept me at the station before throwing me out after a couple of hours.
“I missed my coach home as a result.”
Miss Brookfield will still be standing at the forthcoming elections.
Labour councillor for Earcroft Trevor Maxfield said: “Stephanie is a passionate Blackburn Rovers fan and is down at Ewood week in week out. We are fully behind her.”