The Singapore Religious Council better known as MUIS(Majlis Ugama Islam Singapura) is the sole authority in Singapore which can certify restaurants, manufacturing facilities, food outlets etc as Halal. MUIS is a statutory board setup to advise the President of Singapore on all matters relating to Islam in Singapore.
Most of the popular international restaurant/fast food brands are Halal Certified in Singapore. The sole authority in Singapore which provides Halal certification is MUIS. Many of the International chains such as McDonalds, Pizza Hut etc are halal.
There a few Halal Hotel Restaurants in Singapore certifed by MUIS.
There are two types of restaurants in Singapore Hotels serving Halal Food; Hotels which have a Halal certified restaurant and the Hotels where the restaurant serves food from a halal certified kitchen.