Lena Rettinghaus is a German actress and voice actor based in Berlin. She was born on November 9, 1996, in Berlin. Her training began in 2014 with acting coaching from Kristiane Kupfer in Berlin, and she has continued her education in areas such as singing and speech techniques. Since 2016, she has taken acting classes and coaching at Die Tankstelle.

Rettinghaus began her career with roles in German film and television productions. Her on-screen appearances include parts in the feature films Heilstätten and Abikalypse, both released in 2018. On television, she played the role of Linda de Breyne in the RTL Zwei series F4lkenb3rg - Mord im Internat? and appeared in the web series Offscreen.

Her primary professional focus is on voice acting and dubbing, known in German as synchronization. In this field, she provides the German voice for characters in a wide range of international films and television series. She is known for her work in dubbing English-language live-action productions, animated series, and Japanese anime.

A significant portion of her voice acting credits is in anime. She voiced the character Rin Ootomo in the 2019 anime film Psycho-Pass: Sinners of the System - Case 2: First Guardian, providing the German dubbing for the original Japanese voice actor Sayaka Oohara. Other notable anime roles include Miharu Imai in Rent-a-Girlfriend, Eva Maria Rose in Armed Girl's Machiavellism, Iroha Irodori in Flip Flappers, and Nikotama in Hi Score Girl. She has also voiced characters in The Rolling Girls and provided additional voices for the series.

In addition to anime, her extensive dubbing work encompasses a wide variety of popular international series. She is the German voice of Nichole Brown as Aisha Robinson in the Netflix series Cobra Kai. Her other series credits include roles in Tell Me Lies (as Lucy Albright), The Rookie (as Tamara Colins), Ginny & Georgia (as Padma), Jessica Jones (as Zaya Okonjo), Lucifer (as Maddie Howard), and Marcella (as Emma Backland). In animation, she has voiced characters in franchises such as My Little Pony: Friendship Is Magic and LEGO Ninjago: Dragon Rising.

While her career shows a pattern of working on numerous high-profile international productions distributed by platforms like Netflix, there is no readily available information to suggest she has a defining, exclusive collaboration with a single director or studio. Her notable achievements are marked by the sheer volume and diversity of her voice acting credits across both live-action and animated genres. She is a working actor based in Berlin with professional proficiency in English, French, and Spanish, in addition to her native German.