William G. Colman, a retired federal government executive, urban affairs consultant and a former school board member, yesterday was appointed to fill the vacancy on the Montgomery County Council created by the recent departure of longtime member Norman Christeller.

The six remaining council members chose from a list of 34 applicants, many of whom, like Colman, are county residents with extensive experience in government and civic affairs.

A registered Democrat, as are the other current members of the council, Colman said he is "leaning in the direction" of not seeking election to a new term when the four-year term begun by Christeller expires at the end of this year. He will, though, "give it very serious consideration in due course," he said.

The county charter requires that a council vacancy be filled by a person of the same party as the resigning member.

From 1955 to 1960, Colman served as executive assistant to the director of the National Science Foundation. From 1960 to 1970 he was executive director of the Advisory Commission on Intergovernmental Relations, a national bipartisan body established by Congress to review relations between the U.S., state, and local governments.

Since his retirement he has taught government and urban affairs at the University of Virginia and University of Maryland, served as a member and chairman of numerous governmental and civic associations, and been a consultant to many state and local government organizations. From 1968 to 1972 he was an elected member of Montgomery County's Board of Education.