The flag of the Netherlands province of Groningen has a white cross design with the upper hoist and lower fly sections red, and the remaining two sections blue. Inside the white cross is a thinner green cross.
The colours are based off of the Groningen coat of arms. The white and green cross symbolizes Groningen, the capital city of the province. Red, white, and blue are found on the coat of arms of the Ommelanden, the areas of the province surrounding the capital city. The colours of the city are placed in the centre to symbolise the central location of the city within the province.