3Hz Inc. (Japanese: 株式会社3Hz, Hepburn: Kabushiki-gaisha San Herutsu) was a Japanese animation studio established by ex-Kinema Citrus animators.

Yuichiro Matsuka founded the studio in March 2013.

On June 17, 2024, 3Hz announced that it has transferred its animation planning and production business to A-1 Pictures.

Studio 3Hz and the official X account for the Sword Art Online Alternative: Gun Gale Online II anime confirmed the same staff who have been working on the anime will continue to work on the anime at A-1 Pictures.

[1][2][3] A list of notable staff currently or formerly belonging to the studio.