Hiro Nakajima is a Japanese voice actress born in Tokyo on December 9, 1987. She is a graduate of the Tokyo Animator Gakuin, a vocational school for animation and voice acting. Her real name is Hiroko Itsuki. She began her career in 2007, with one of her earliest roles being in the anime series Prism Ark. Early in her career, she was affiliated with the talent agency 81 Produce, and she later became a freelancer.

Nakajima is known for her role as Eru Harune in the 2011 anime series Pretty Rhythm Aurora Dream. In this series about aspiring idol performers, she voiced one of the Harune sisters, characters central to the story. She also voiced other roles in the Pretty Rhythm franchise, including in the sequel series Pretty Rhythm: Dear My Future.

Her other notable anime roles include Chousuke Takatsuki in THE iDOLM@STER, Karashina in Baku Tech! Bakugan, and various minor characters in series such as K-ON!, Haikyu!!, and Love, Election, & Chocolate. Her voice acting work also extends to video games, drama CDs, and dubbed versions of foreign productions. For instance, she provided the Japanese voice for the title character in the Disney animated series Jake and the Never Land Pirates.

Throughout her career, Nakajima has frequently collaborated professionally with her twin sister, Aki Nakajima, who is also a voice actress. This collaboration was notably seen in Pretty Rhythm Aurora Dream, where Aki voiced Uru Harune, the twin sister of Hiro's character, Eru. She was recognized early in her career as a promising new talent at a voice actor award discovery audition.