Youji Ueda is a Japanese voice actor born on August 7, 1971, in Hyogo Prefecture. He is affiliated with the talent agency Amuleto. He began his career after training at the Tokyo Announce Academy and the Bungakuza Theatre Arts Institute, initially joining Mausu Promotion in 2001 before moving to his current agency.

His career is marked by a high degree of versatility, allowing him to portray a wide range of characters across numerous anime series, video games, and dubbed foreign films. He has taken on roles that include the user-specified Paz in Ghost in the Shell: The New Movie, Drei in Hiiro no Kakera - The Tamayori Princess Saga, the Dark General in Jewelpet Kira☆Deco—!, Kagerō Usui in Zan Sayonara Zetsubō Sensei and its sequel, the Narrator in And Yet the Town Moves, Kumakubo in Fighting Beauty Wulong, Mr. Akiyama in JAPAN, Our Homeland, Senjirou Shiba in Kotetsushin Jeeg, Luchino in Bakusō Kyōdai Let's & Go!! WGP, Toyotomi Hideyoshi in Gifū Dōdō!! Kanetsugu to Keiji, Bakudōra in Sanjōgattai Transformers Go!, and Mii-chan in Senyū. Dai 2 Ki.

Beyond these, he is widely recognized for iconic roles such as Robert E.O. Speedwagon in JoJo's Bizarre Adventure, Eisen in Frieren: Beyond Journey's End, Ōetsu Nimaiya in Bleach: Thousand-Year Blood War, and Leif Ericson in Vinland Saga. He also took over the role of Ikarudo Tentacles in the Japanese dub of SpongeBob SquarePants following the passing of the original voice actor. His work is not limited to animation; he is also active in video games, with roles such as Retsu in Street Fighter 6, and in dubbing foreign live-action films, where he is known as the official Japanese voice for actors like Aidan Gillen and Tim Blake Nelson.

Throughout his career, Ueda has frequently collaborated with a wide array of other voice actors. Data on his team-ups indicates he has worked most often with Shinichiro Miki, followed by Unshō Ishizuka and Katsuyuki Konishi, among many others. He is married to fellow voice actress Yukiko Nagashima. In addition to his performance work, he has shown commitment to the industry by co-signing a petition in 2024 regarding the protection of voice actors' work from unauthorized use in AI learning.