Jerold C. Hoffberger denied published reports yesterday he is in "serious negotiations" for the sale of the Baltimore Orioles to a group that would play some of its 1979 home games in RFK Stadium.

The Baltimore News American quoted "a source close to the major league baseball scene" as saying that talks had been proceeding with an unidentified group for three weeks and that a sale, for $12 million, was expected by the end of the year.

"I talk to lots of people all the time," Hoffberger said. "What do you mean by 'serious negotiations?' If 'serious negotiations' means have I talked to some people, sure, I talk to people all the time . . . I'm not in serious negotitions."

Hoffberger has been willing to sell the Orioles for the last four years. But no one has been willing to meet his price.

Hoffberger said yesterday that he had talked to unidentified interests in the Washinton area and Connecticut. "Somebody from Washington is always calling me," he said, describing these chats as "preliminary talks; I'm always in preliminary talks."

Hoffberger said Ken Pollock Sr., a Wilkes-Barred, Pa., businessman who showed an interest in buying the team and moving it to Washington, has not talked to him about such a move lately.

Bob Sigholtz, general manager of the D.C. Armory Board, which manages RFK Stadium, said no one has contacted him concerning Oriole dates in RFK next season.

Under terms of the Orioles' lease in Baltimore, they are forced to play at least 70 dates in Memorial Stadium next season, leaving 11 possible dates at another site. The current contract, signed March 11, 1977, expires in 1983. But the Orioles can exercise an option before June 30, 1979, that would enable the team to play all of its 1980 games in another city.