Colleen O'Shaughnessey is an American voice actress known for her extensive work in English-language dubs of anime, animated series, and video games. Born Colleen Ann O'Shaughnessey on September 15, 1971, in Grand Rapids, Michigan, she developed an early interest in performance and earned a Bachelor of Fine Arts degree in musical theatre from the University of Michigan. She is also credited under names such as Colleen Villard, Olivia O'Connor, and Olivia Charles.

O'Shaughnessey's career in voice acting began in the late 1990s, with one of her first major roles being Sora Takenouchi in the popular anime series Digimon: Digital Monsters, a part she played across the first two seasons and reprised in later films like Digimon Adventure tri.. This role helped establish her in the industry. She is also widely recognized for her long-running portrayal of Ino Yamanaka in the Naruto franchise, a role she has voiced in the original series, Naruto: Shippuden, and Boruto: Naruto Next Generations. Her work in anime also includes Suzy Mizuno in Zatch Bell!, the character Dizzie Lizzie in Tokyo Pig, and Nelliel Tu Odelschwanck in Bleach.

Beyond anime, O'Shaughnessey has lent her voice to numerous Western animated series. She is known for her role as Jazz Fenton in Danny Phantom and as Jody Irwin in The Life and Times of Juniper Lee. She also voiced Janet Van Dyne, also known as the Wasp, in The Avengers: Earth's Mightiest Heroes. A significant and ongoing part of her career began in 2010 when she started voicing characters in the Sonic the Hedgehog franchise, first as Charmy Bee and then, starting in 2014, as Miles "Tails" Prower in Sonic Boom. She has continued to voice Tails in subsequent animated projects and notably reprised the role in the live-action hybrid films Sonic the Hedgehog, Sonic the Hedgehog 2, and Sonic the Hedgehog 3, marking a unique crossover from voice acting in animation to the big screen.

Her work also extends extensively into the video game industry. O'Shaughnessey has provided voices for a wide array of characters, including KOS-MOS in Xenosaga Episode II: Jenseits von Gut und Böse, Genis Sage in Tales of Symphonia, and multiple characters in the Sonic the Hedgehog video games. She has also contributed her voice to major titles such as the Fallout, Final Fantasy, and Persona series.

Throughout her career, O'Shaughnessey has participated in various projects that have brought together recurring colleagues in the voice acting community. For instance, she worked alongside Lara Jill Miller in both Digimon and The Life and Times of Juniper Lee. Her body of work demonstrates a sustained collaboration with major animation studios and dubbing houses in Los Angeles.