A Baltimore City judge and two onetime aides of former Gov. Marvin Mandel were indicted here today on charges of participating in a bribery scheme to win exceptions to a Baltimore County building moratorium.

District Court Judge Allen Spector, a former city councilman, and Maurice Wyatt, Mandel's patronage chief, were accused of paying a total of $11,650 in bribes to former state environmental health administrator Donald Noren in exchange for the favorable zoning rulings.

The indictments charge that the bribes were paid to Noren between 1974 and 1976. At the time, Spector was a private attorney and a Baltimore city councilman, while Wyatt was a key Mandel aide an Noren was an assistant attorney general assigned to the state health department.

Earler, Wyatt and Noren had been law partners.

Noren resigned his state post in January.

The four indictments were returned today by a special city grand jury that had beed working with the office of Maryland Special Prosecutor Gerald Glass.

Wyatt today vehemently denied the charges. "I am confident that I have done nothing illegal or improper. I am convinced I will be totally vindicated in this matter," he said.

Spector, 45, a former state delegate and city councilman, was appointed to the district court judgeship in 1977.

Reached at his home yesterday, Spector denied the charges but was reluctant to comment further, "I can't try the case in the newspaper," he said. "My day will come in court."

Asked if his indictment was unexpcted, Spector replied "yes," adding that he had talked with special prosecutor Glass once, last May, in connection with the case. He would not say what was discussed.

The judge added that he had requested chief District Court Judge Robert Sweeney to assign him to purely administrative duties until the case is resolved.

Noren could not be reached for comment.