Berta Cortés is a professional Spanish voice actress based in Barcelona, actively working in the dubbing industry. She is also known by her full name, Berta Cortés García. Her first recorded role in dubbing was providing the voice for the character Nick in the series Honey, I Shrunk the Kids. Beyond voice acting, she has also appeared in live-action roles, such as a flight attendant in the 2012 film I Want You.

Cortés has built an extensive career voicing characters in numerous anime series and films for Spanish audiences, particularly in Catalan and Castilian dubs. A significant portion of her work is for the long-running franchise Detective Conan, also known as Case Closed. She is notably the voice of Ayumi Yoshida, a member of the Junior Detective League, in a vast number of films and specials for the Catalan dub. Her film credits for this role include The Bride of Halloween, The Scarlet Bullet, The Fist of Blue Sapphire, and many others such as The Million-dollar Pentagram and The Black Iron Submarine. In addition to Ayumi, she has voiced other characters in the Detective Conan universe, including Ran Mouri in early Spain dubs, Sonoko Suzuki, and the enigmatic Vermouth in the series Detective Conan: Zero's Tea Time.

Her repertoire extends to a wide variety of other notable anime. She voiced Hojo in the Spain dub of Teasing Master Takagi-san and Miime in both the Spanish and Catalan dubs of Harlock: Space Pirate. She played Akane Shinjo in Miracle Giants Domu-kun and was the Spanish voice of Bubbles in Demashitaa! Powerpuff Girls Z. Cortés also has roles in the OAV series The Tales Trilogy, where she voiced Chin Chin and the Match selling girl, and in His and Her Circumstances as Kano Miyazawa. Her work on The Legend of the Dog Warriors: The Hakkenden includes voicing Hamaji as well as Shinbei Inue and Daihachi.

Other significant anime roles in her career include Tomoyo Daidouji in the Cardcaptor Sakura films, Nabiki Tendo in Ranma ½, Kana Sôma in Fruits Basket, and Amanda O'Neill in Little Witch Academia. Her work spans various genres and eras, demonstrating her versatility and long-standing presence in the Spanish dubbing industry.