The coat of arms of Meulan-en-Yvelines is blazoned as:
Azure semy-de-lys or, a chief chequy or and gules of four tiers.
The shield of arms is composed of the ancient arms of France, granted to the village as an augmentation of honour by Henri IV in 1590, with a chief displaying the first four tiers of the chequy or and gules arms of the ancient Counts of Meulan.