More books are being written for the teen-age market than ever before. Here are a few more suggestions -- among many -- from authors/educators Betsy Hearne and G. Robert Carlsen and Evelyn Shavel of the Young Adult Services Division of the American Library Association:

* Judy Blume (in case you haven't heard of this adolescent favorite). Teen boys especially like Then Again Maybe I Won't (hardcover, Bradbury Press; paperback, Dell) about a boy whose adolescent problems are compounded when his family moves to a strange new area.

* Paula Danziger. The Cat Ate My Gymsuit (hardcover, Delacorte; paperback, Dell). The excuse for not dressing for gym when an overweight heroine tries to handle her feelings about herself.

* M. E. Kerr. Dinky Hocker Shoots Smack (hardcover, Harper & Row; paperback, Dell). Not about heroin, but about a girl whose drug-counselor mother pays more attention to work than home.

* Felice Holman. Slake's Limbo (hardcover, Scribner's; paperback, Dell). Haunting story about a boy who takes to the New York subways.

* Richard Peck. Dreamland Lake (paperback, Avon). Good mystery about two boys who meet the unexpected at an abandoned amusement park. Also, Secrets of the Shopping Mall (hardcover, Delacorte; paperback, Dell). About kids hiding out at a mall.

* Betty Greene. Summer of My German Soldier (hardcover, Dial Press; paperback, Bantam). A Jewish girl's shattering experiences that derive from her relationship with a German POW during World War II.

* Sandra Scoppettone. The Late, Great Me (hardcover, Putnam; paperback, Bantam). Because of her loneliness, a young girl turns to alcohol until tragic results send her for help.