Masao Imanishi was a Japanese voice actor and actor born on March 27, 1931, in Kyoto Prefecture. He passed away on August 14, 2000. At the time of his death, he was affiliated with the Tokyo Actor's Consumer's Cooperative Society, also known as Haikyo. He stood 165 cm tall.

Imanishi's career spanned several decades, from the early 1960s to the year 2000, during which he contributed to numerous anime, dubbing, and live-action projects. His work was prolific, encompassing a wide variety of roles in both animated series and films. In anime, he was known for playing characters such as Franken in the 1968 version of Kaibutsu-kun and the Captain in Giant Gorg. He also provided voices for classic series like Lupin III: The Fuma Conspiracy, The Wonderful Adventures of Nils, and Astro Boy. His filmography includes roles in Doraemon: The Record of Nobita's Spaceblitzer and The Sensualist, where he is credited as the Head Clerk. He also voiced the character Gennai in The King of Minami 2.

Beyond animation, Imanishi was active as a voice actor for Japanese dubs of foreign films, lending his voice to numerous Hollywood productions for television broadcasts and home video. Notable dubbing roles included Gerald O'Hara in Gone with the Wind, Bull in Lady and the Tramp, and roles in films such as The Alamo, Giant, and Stagecoach. He also appeared as a live-action actor in television dramas and films, including the television series Ninja Sentai Kakuranger and the film The Imperial Navy.

Throughout his career, Imanishi frequently collaborated with a number of other prominent voice actors, including银河万丈 (Ginzo Matsuo), 广森信吾 (Shingo Hiromori), 泽木郁也 (Ikuya Sawaki), 古谷彻 (Tohru Furuya), and 永井一郎 (Ichiro Nagai).