The coat of arms of the Diocese of Singapore which belongs to the category of ecclesiastical heraldry, consists of a mitre surmounted on a St Andrew's Shield.

The mitre symbolises apostolic authority and divine endorsement to govern the Anglican diocese in the region.

The crozier symbolises the bishop's episcopate and the key represents the access to heaven. Emblazoned upon the St Andrew's Shield are four bunches of wheat symbolising the harvest fields which God has entrusted to the diocese.