Washington Post staff writer Charles A. Krause and photographer Frank Johnston have won top prizes in the newspaper division of the Overseas Press Club's annual foreign reporting competition for their coverage of the Jonestown massacre in Guyana.

Krause, the Post's Buenos Aires bureau chief, won the club's Hal Boyle award for best newspaper reporting from abroad in 1978. Johnston, whose pictures of the massacre scene were reprinted in magazines and newspapers around the world, won the award for photographic reporting from abroad.

NBC News correspondent Don Harris and cameraman Bob Brown, both of whom were killed in a fusillade of bullets while covering the Guyana story, were honored posthumously in the TV spot reporting category for their Jonestown coverage.

Another posthumous award went to Joe Alex Morris Jr., a Los Angeles Times correspondent who was killed by a gunshot earlier this year while covering fighting on the outskirts of Tehran, Iran.

Flora Lewis, of the Paris bureau of the New York Times, was the winner in the interpretive article category. The Miami Herald's Jim Morin won the top prize for editorial cartoons on foreign affairs topics in 1978.

Andrew Nagorski of Newsweek won the foreign business news reporting award for a study of "Japan vs. The World." Susan Meiselas of Time magazine, for her pictures of civil insurgence in Nicaragua, won the Robert Capa award for photographic reporting requiring unusual courage or enterprise.

The award for best magazine interpretation of foreign affairs went to Donald R. Katz for an article on Ethiopia that appeared in Rolling Stone.