Komi Michitsuna served as a bushō during the Sengoku period.  He was a retainer of the Kira clan of Mikawa Province.

The Komi were a branch of the Ōkōchi clan based in Komi in the Hazu District of Mikawa.  Michitsuna is surmised to have been adopted by the Komi clan from the Ōkōchi clan.  The name of Komi Etchū-no-kami appears in historical records from the same period but may have been in reference to his adoptive father.  

There is an alternate theory that Michitsuna originated from the Takahashi clan who served as senior retainers of the Kira.  Michitsuna died at Hikuma Castle so his lineage is uncertain.

Similar to his older brother, Ōkōchi Sadatsuna, Michitsuna was active in Tōtōmi Province, serving as a local governor of the Kawawa manor.  He stubbornly resisted the invasion of Tōtōmi by Imagawa Ujichika, joining forces with Shiba Yoshitatsu to hole-up in Hikuma Castle.  On 8/19 of Eishō 14 (1517), the castle fell and Michitsuna, together with Sadatsuna, took their own lives.