Is Golgo 13: Queen Bee hentai?
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

OVA · 1998 · 1 episodes · R+ - Mild Nudity
Action, Adult Cast, Adventure, Drama, Military, Seinen
Master assassin Golgo 13 is hired by the advisor of presidential candidate Robert Hardy to assassinate "Queen Bee," the beautiful and deadly leader of a South American guerilla army. Golgo, however, finds this job too easy and digs further information to find out the true connection between Hardy and Queen Bee. (Source: ANN)
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