Councillor Steve Batkin will fill one of the three vacancies at Edensor High School, in Longton.
He was elected unopposed after the other political groups failed to put up alternatives.
Councillors had previously accused the BNP group of using underhand tactics to get its members elected as school governors.
They complained that the BNP had sprung nominations at the last minute, breaking the unwritten rule that candidates have to be announced in advance
On this occasion the BNP followed this rule, declaring its nomination a week before the meeting.
Council leader Ross Irving, who also leads the Conservative group, said the Tories had been unable to find a suitable candidate for Edensor.
But he admitted that he was disappointed that none of the other groups had put up a nomination either, allowing Mr Batkin to be elected unopposed. He said: "I think this shows how difficult it can be to get people to commit to being a school governor. It isn't like it used to be when the role wasn't very onerous.
"It is worrying that the BNP were the only group which could find a candidate. I certainly hope Mr Batkin will bear in mind the educational mix found at that particular school."
In October the BNP failed to get two of its members elected as governors at Longton High School and St Augustine's Primary School, both in Meir.
Although the BNP group waited until halfway through a full council meeting to make its nominations, the Labour group also put up candidates, who were both elected.
But this time there were no nominations forthcoming from the group.
Labour leader Mohammed Pervez said: "I very much hope that other mainstream political parties will now join forces to ensure that more people put their names forward for these important positions."
BNP group leader councillor Michael Coleman says he has been left disappointed by members of his party being blocked from joining schools.
Mr Coleman, a governor at Longton High School, said: "It's disappointing that other groups don't back us being governors. I have voted for members of other parties in the past as it is important vacancies for governors are filled.
"It seems they would rather see them left empty or get the wrong people in just to keep us out. It's essential if the city is to progress to get the governing bodies working correctly.
"Steve Batkin will do his best for Edensor."
There are now seven schools in Stoke-on-Trent which have BNP councillors as governors.
The other six are: Longton High, Meir; Carmountside Primary School, Abbey Hulton; Mitchell Business and Enterprise College, Bucknall; Middlehurst School, Chell; Maple Court Primary, Bentilee; and Park Hall Primary.
Mr Batkin was unavailable for comment.
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