Ignatius Datong Longjan (19 May 1944 – 10 February 2020) was a Nigerian diplomat and politician who served as the senator representing the Plateau South senatorial district from 2019 until his death in 2020.
[2] Longjan was born in Kwa, Quanpaan Local government area of the present day Plateau State.
He attended the Kwa Junior/Senior Primary School and St. Joseph's College, Vom.
[3] Most of his working life was spent in the Nigerian foreign service in Nigerian missions abroad including Hamburg in Germany, The Hague in Holland, Conakry in Guinea, New York in the USA and Moscow in Russia.
In 2019, he contested the election to represent the Plateau Southern senatorial seat in the Nigerian National Assembly.