ブランドン・ウォルシュとバレリー・マローンがビバリーヒルズから去り、ディラン・マッケイが復帰し、ドナのいとこジーナがビバリーヒルズにやってきた。驚く事件満載のシーズン9に登場するのは、ブランドン、ケリー、ディラン、ドナ、デビッド、スティーブ、バレリー、ノア、ジャネット、マット、ジーナ。ノアの飲酒問題、三角関係の恋愛に悩むケリー、秘密に裏切りなどが渦巻くシーズン9は今まで以上に何が起こるか予測できない！

Season nine of Beverly Hills, 90210, is an American teen drama television series began airing on September 16, 1998 on Fox television network. The season concluded on May 19, 1999 after 26 episodes. This season follows the gang into adulthood as they deal with numerous issues that adults face in their personnel and professional lives such as relationships, financial problems, crime, death, alcoholism, domestic violence, gang violence, drug abuse, bulimia, rape and their growing careers.

The ninth season aired Wednesday nights at 9/8c. The season was released on DVD as a seven disc boxed set under the title of Beverly Hills, 90210: The Ninth Season by Paramount.