The Al-Ansar Mosque is a mosque in Singapore that was among the first few to be built under Phase One of the Mosque Building Fund Programme. It was completed in 1981 and is located in the Bedok North area, at the junction of Chai Chee Street and Bedok North Avenue 1. The mosque originally could accommodate up to 3,500 people at any one time. Apart from daily and Friday prayers, the mosque offers madrasah classes during weekdays and weekends.