Two veteran Time Inc. officials were appointed yesterday as editor and publisher of The Washington Star, completing a reorganization of the newspaper's top executive posts.

Murray J. Gart, 53, as assistant managing editor and chief of correspondents of Time magazine, was named as Star editor, the highest editorial position. George W. Hoyt, 41, who had been appointed as The Star's general manager last month, was promoted to publisher, the senior business post. Hoyt had previously headed a suburban Chicago newspaper chain owned by Time Inc.

The appointments were announced by Time Inc. president James R. Shepley, who is also The Star's board chairman. Time Inc., a New York based publishing giant, recently bought The Star for about $28 million from Joe L. Allbritton, a Texas businessman who had taken over the newspaper four years ago. Allbritton resigned as Star publisher May 31.

The reorganization at The Star began in April with the appointment of Sidney Epstein, a Star veteran, as the newspaper's executive editor. Donald M. Wilson, vice president of Time Inc. for corporate and public affairs, said yesterday that Epstein would retain his position and would retain his position and would assist Gart in running the newspaper.

Under The Star's revised executive setup, Wilson said, Gart and Hoyt will both report to Shepley. Among other recent changes at the nespaper were the appointments last month of two managing editors, Barbara S. Cohen and Philip M. Evans. Both had previously held editing positions at The Star.

Gart's move to The Star appears to coincide with an increase in The Star's publication of articles prepared by Time Inc. writers based in the United States and abroad. such stories have been filed by a reporting staff that Gart has overseen for the past nine years. Wilson said yesterday that Time Inc. will make available three news, feature or other stories every day for possible publication by The Star.

Gart, who has gained a reputation as a ough hard-driving newsman and administrator, joined Time Inc. in 1955. He held positions as Times's bureau chief in Toronto, Boston, Chicago and London and as assistant managing editor of Fortune Magazine before becoming chief of correspondents of the Time-Life News Service in 1969. A Boston native, he had previously worked as a reporter and editor for several newspapers.

Hoyt had been president of Pioneer Press, Inc., a chain of 18 weekly newspapers in the Chicago suburbs. Time Inc. officials say he turned the slumping chain into a profitable enterprise in his seven years there.