The Nicoll Highway in Singapore collapsed, killing four workers.

Nicoll Highway is a major arterial road in Singapore which links the junctions of Guillemard Road, Sims Way and Mountbatten Road in Kallang to the junctions of Esplanade Drive, Raffles Avenue and Stamford Road in the city. En route, it passes through the areas of Kallang, Kampong Glam and Marina Centre.

Singapore, officially the Republic of Singapore, is an island country and city-state in Southeast Asia. The country's territory comprises one main island, 63 satellite islands and islets, and one outlying islet. It is about one degree of latitude north of the equator, off the southern tip of the Malay Peninsula, bordering the Strait of Malacca to the west, the Singapore Strait to the south along with the Riau Islands in Indonesia, the South China Sea to the east, and the Straits of Johor along with the State of Johor in Malaysia to the north.

The Nicoll Highway collapse occurred in Singapore on 20 April 2004 at 3:30 pm local time when a Mass Rapid Transit (MRT) tunnel construction site caved in, leading to the collapse of the Nicoll Highway near the Merdeka Bridge. Four workers were killed and three were injured, delaying the construction of the Circle Line (CCL).

April 20 is the 110th day of the year in the Gregorian calendar; 255 days remain until the end of the year.