The youngsters in key stages 1 and 2 took part in the competition held at the University of Cranfield, and was organised by the Redborne Sports Partnership.
The 12 children representing KS1 worked as a team to collect points from a variety of different athletic activities based on jumping, throwing and running skills.
In KS2, the pupils earned points for their performances in six field events - jumping and throwing - and this was followed by a variety of timed, competitive running races.
Out of the eight schools competing, Fairfield Park finished first for both KS1 and KS2, and the first the school has won both competitions.
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Miss Jackson, PE subject leader, said how extremely proud she was of both KS1 and KS2 teams for winning the double at the festival.
She added: “All the children represented the school with effort and enthusiasm and were so pleased that all of their hard work and practice during lunchtimes had paid off.”