The Dag Hammarskjöld Library is a library on the grounds of the headquarters of the United Nations, located in the Turtle Bay/East Midtown neighborhood of Manhattan in New York City. It is connected to the Secretariat and Conference buildings through ground level and underground corridors. It is named after Dag Hammarskjöld, the second Secretary-General of the United Nations. The library was founded in 1946, and the current library building was completed in 1961.