Iris Reinhardt Hassenzahl is a German voice actress known for her work in the dubbing of anime and animated series. She was born in Hanau, Germany in 1986. Her full professional name is sometimes credited as Iris R. Hassenzahl.

Hassenzahl is particularly recognized for her long-standing association with the Fate anime franchise, where she has consistently provided the German voice for the character Saber. Her roles in this universe include Saber in Fate/Zero and Fate/stay night: Unlimited Blade Works. She also voiced Saber Alter and Ayako Kawasumi in the Fate/stay night: Heaven's Feel film trilogy. Her work in the franchise extends to the television special Fate/Grand Order: First Order, where she voiced the characters Fô and Artoria Pendragon (Alter).

In addition to her prominent role in the Fate series, Hassenzahl has contributed her voice to a variety of other anime titles. She voiced Lilith Asami in Trinity Seven and had a role in Kill la Kill as Omiko Hakodate. Her filmography also includes a role in the 2009 live-action film Dogtooth.

One of her notable early credits is providing the voice for the character Chastele Aiheap in the 2009 animated film Tales of Vesperia: The First Strike, for which the German dubbed version was released in 2011. This role connects her to the wider Tales of Vesperia franchise. Beyond these major titles, her work includes various roles in television series such as voicing a Konditorin in an episode of the long-running German series Löwenzahn and appearing in Wilde Zeiten - Alte Freunde neu gemischt!.

Beyond her voice acting career, Hassenzahl has also performed as a stage actress. In 2013, she appeared in the play Sex. Oder so at the Stalburg Theater in Frankfurt, a production noted for its mature themes.