It is the first time a complete network of parks across a whole town or city has been awarded the Green Flag.
The award signals that The Parks Trust’s green spaces across the city are of the highest possible environmental standards, are well maintained and have excellent visitor facilities.
The Parks Trust received the award following a judging process, which included the submission of a detailed management plan for the full Milton Keynes parks network and a day of visits by the judges to a cross section of different park areas across the city, selected by the judges.
Chief executive David Foster said: "We are absolutely delighted to receive a Green Flag Award for the parks, woodlands and lakes we manage across Milton Keynes.
"We know how much quality green spaces matter to the city’s residents and visitors, and this award celebrates the dedication that goes into maintaining our parks to such a high standard. In particular it recognises the skills and dedication of our staff, our loyal contractors and many of our volunteers who all play their part in keeping the parks looking good.
Award scheme manager Paul Todd said: "As Milton Keynes marks its 50th anniversary, we are delighted that they are raising a Green Flag Award for the first time. The vision of the planners 50 years ago made parks integral to the design and development of the town, and we believe parks are even more important 50 years on. Congratulations to all the staff and volunteers at The Parks Trust, who work tirelessly to maintain the high standards demanded by the Green Flag Award."