Roman Catholic Bishop Donal Lamont, who was expelled from white-ruled Rhodesia in 1977 for opposing its policies of racial discrimination, has died. He was 92.

Lamont, who died on August 14 in Dublin and was buried five days later in his native Ballycastle, Northern Ireland, was expelled after receiving a 10-year prison sentence. He pled guilty to a charge of allowing nuns to provide medical attention to black rebels fighting to overthrow Rhodesia's last white leader, Ian Smith. Lamont argued in his defence Christians must not act as ''informers'' to the state nor refuse medical aid to anyone ''regardless of religion or politics''.

In 1972, after rebels laun-ched a seven-year bid to wrest Rhodesia from white control, Lamont pinned primary blame for the bloodshed on Smith. He wrote: ''Conscience compels me to state your administration is largely responsible for the injustices which have provoked the present disorder.''

Ordained a priest in 1937, he went to Rhodesia in 1946 to establish a Carmelite mission. He was appointed bishop of Umtali, a diocese stretching along the border with Mozambique, in 1957.

After Smith's defeat by rebel leader Robert Mugabe, Lamont returned in 1980 to the newly renamed Zimbabwe and remained bishop until 1982.

Lamont was nominated for the Nobel Peace Prize in 1978. In his retirement he lived in a Dublin Carmelite community.

He is survived by several nieces and nephews.