The Most Reverend Dom Janusz Marian Danecki (8 September 1951 – 30 August 2024) was a Polish prelate, auxiliary bishop of the Roman Catholic Archdiocese of Campo Grande.

Danecki entered the Order of Friars Minor Conventual in 1971, formally professing his faith on 8 December 1975.

For eight years he exercised the priestly ministry in Poland, passing through several parishes and also in the Roman Catholic Archdiocese of Warsaw until 1984.

[2] On 14 April 1985, he was sent to the Mission of Saint Maximilian Maria Kolbe in Brazil, linked to the prelature of Tefé.

Danecki died in Campo Grande, Mato Grosso do Sul on 30 August 2024, at the age of 72.