An aircraft crashed near Ndola in Northern Rhodesia, resulting in the deaths of 16 people, including United Nations secretary-general Dag Hammarskjöld.

On 18 September 1961, a DC-6 passenger aircraft of Transair Sweden operating for the United Nations (UN) crashed near Ndola, Northern Rhodesia. The crash resulted in the deaths of all people on board, including Dag Hammarskjöld, the second secretary-general of the United Nations, and 15 others. Hammarskjöld had been en route to ceasefire negotiations with Moïse Tshombe during the Congo Crisis. Three official inquiries failed to conclusively determine the cause. Some historians and military experts like Susan Williams have criticized the official inquiries, pointing to evidence of foul play that had been omitted from the inquiries.

Ndola is the third largest city in Zambia in terms of size and population, with a population of 627,503, after the capital, Lusaka, and Kitwe, and the second largest in terms of infrastructure development after Lusaka. It is the industrial and commercial center of the Copperbelt, Zambia's copper-mining region, and capital of Copperbelt Province. It lies just 10 kilometres (6.2 mi) from the border with DR Congo. It is also home to Zambia's first modern stadium, the Levy Mwanawasa Stadium.

Northern Rhodesia was a British protectorate in Southern Africa, now the independent country of Zambia. It was formed in 1911 by amalgamating the two earlier protectorates of Barotziland-North-Western Rhodesia and North-Eastern Rhodesia. It was initially administered, as were the two earlier protectorates, by the British South Africa Company (BSAC), a chartered company, on behalf of the British Government. From 1924, it was administered by the British Government as a protectorate, under similar conditions to other British-administered protectorates, and the special provisions required when it was administered by BSAC were terminated.

Dag Hjalmar Agne Carl Hammarskjöld was a Swedish economist and diplomat who served as the second secretary-general of the United Nations from April 1953 until his death in a plane crash in September 1961. As of 2025, he remains the youngest person to have held the post, having been only 47 years old when he was elected. He was a son of Hjalmar Hammarskjöld, who served as Prime Minister of Sweden from 1914 to 1917.