Lupin the 3rd Part I is a Japanese anime television series produced by Tokyo Movie. Part of the Lupin III franchise, it is the first anime television adaptation of the Lupin III manga series created by Monkey Punch. The series was originally broadcast as simply Lupin III on Yomiuri TV between October 24, 1971 and March 26, 1972. Among English-speaking fans, this series was commonly known as the "Green Jacket" series in reference to Lupin's outfit, but more recently it is now known as "the first Green Jacket" series because of the outfit's return in Part 6.

TMS Entertainment Co., Ltd. , formerly known as the Tokyo Movie Shinsha Co., Ltd., also known as Tokyo Movie or Kyokuichi Tokyo Movie, is a Japanese animation studio established on October 22, 1946.