Jeff Johnson is an English-language voice actor associated with anime series dubbed by Funimation. He is known for his work in several popular isekai and fantasy anime franchises.

One of his most prominent and consistent roles is voicing the character Demiurge. He has provided the English voice for this character across multiple installments of the Overlord series, including the main seasons and the 2015 anime, as well as the 2025 film Overlord: The Sacred Kingdom. He also reprised the role of Demiurge for the English dub of the crossover comedy series Isekai Quartet and its second season, Isekai Quartet 2.

His work on the Isekai Quartet series also involved voicing more than one character. In addition to Demiurge, he voiced Warren Grantz in the first season and took on the role of Vooren Grantz in the second season.

Outside of the Overlord and Isekai Quartet universe, Johnson's voice acting credits include the role of Makoto Takiya in the English dub of Miss Kobayashi's Dragon Maid S. His filmography also includes voice work in the English adaptations of other anime features, such as The Boy and the Beast and Evangelion: 1.0 You Are (Not) Alone.