Is Lupin III: Part III hentai?
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

TV · 1984 · 50 episodes · R+ - Mild Nudity
Action, Adult Cast, Adventure, Comedy, Seinen
Lupin III chronicles the adventures of Arsene Lupin III, the world's greatest thief, and his partners in crime: master marksman Daisuke Jigen, beautiful and scheming Fujiko Mine and stoic samurai Goemon Ishikawa XIII. Lupin and his gang travel around the globe in search of the world's greatest treasures and riches and always keeping one step ahead of the tireless Inspector Zenigata, who has vowed to bring Lupin to justice. (Source: ANN)
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