Oil-rich Brunei has banned public celebrations of Christmas, including sending festive greetings and the wearing of Santa Claus hats.

Muslims seen celebrating Christmas and non-Muslims found to be organising celebrations could face up to five years jail.

Sultan Hassanal Bolkiah, one of the world's richest men, ordered the introduction of sharia in Brunei last year. Credit:Rohan Thomson

However the country's non-Muslims, who comprise 32 per cent of the 420,000 population, can celebrate Christmas in their own communities on the condition that the celebrations are not disclosed to Muslims.

Imams have told followers in the tiny Borneo nation to follow a government edict last year banning celebrations that could lead Muslims astray and damage their faith, according to the Borneo Bulletin.