茨木司（いばらきつかさ、生年不詳-慶応3年6月14日(旧暦)（1867年7月15日））は、会津藩出身の新選組隊士。

Tsukasa IBRAKI (year of birth unknown - July 15, 1867) was a member of Shinsengumi (a group who guarded Kyoto during the end of Tokugawa Shogunate) from Aizu domain. - Wikipedia日英京都関連文書対訳コーパス

他にも、茨木司、佐野七五三之助、富川十郎、中村五郎ら10名も後に合流を図ったが、嘆願に行った会津藩邸で、茨木、佐野、富川、中村の四人が死亡（切腹、殺害両説あり）、残りの6人が放逐という結末となった。

Ten other persons including Tsukasa IBARAKI, Shimesaburo SANO, Juro TOMIKAWA, Goro NAKAMURA tried to join Goryo-eji later, but four of them, IBARAKI, SANO, TOMIKAWA, and NAKAMURA died in the Aizu domain residence where they had gone to make an appeal (there are two theories that state that they either committed seppuku (disembowelment) or that they were killed.) while the other six were expelled. - Wikipedia日英京都関連文書対訳コーパス

そのため、後続として脱退を懇願した茨木司、佐野七五三之助、富川十郎、中村五郎らは合流が叶わず、会津藩京都屋敷にて自害した。

Therefore, those who solicited the their withdrawal from the force with the intention to follow Arinosuke MONAI, such as Tsukasa IBARAKI, Shimenosuke SANO, Juro TOMIKAWA and Goro NAKAMURA, were not allowed to join him, and they committed suicide at Kyoto residence of Aizu Domain. - Wikipedia日英京都関連文書対訳コーパス