President Reagan yesterday nominated Nan R. Huhn, chief of the juvenile section of the D.C. corporation counsel's office, to a seat on the D.C. Superior Court.

If confirmed by the Senate to the 15-year appointment, the 38-year-old Huhn will succeed Judge David L. Norman, who retired last May, and will become the seventh woman on the 44-judge trial court.

Huhn has been in the juvenile section of the criminal division for 10 years, served as assistant chief of the 16-lawyer section for six years and chief of the section since 1981. The juvenile section prosecutes youth offenders and handles litigation of child abuse and neglect cases.

Huhn is the third woman nominated to the local bench by Reagan, who has been criticized by women's groups, including the National Association of Women Judges, for not nominating enough women.

D.C. Superior Court Judge Virginia L. Riley was nominated by Reagan last November, and former D.C. Corporation Counsel Judith W. Rogers was nominated for the D.C. Court of Appeals last June. Huhn's nomination is Reagan's 14th to the trial court in 2 1/2 years. He also has nominated three members of the nine-member D.C. Court of Appeals.

Huhn is the third nominee in the last year from the D.C. corporation counsel's office, which has seen several major personnel changes recently, including Rogers' departure, the transfer of her deputy, Frederick D. Dorsey, to become People's Counsel, and now Huhn's departure.

Huhn, who was born in Gulfport, Miss., graduated from Harpur College (State University of New York) and received her law degree from American University. She has been active in numerous organizations dealing with juvenile justice and child abuse and neglect.