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A friendly reminder regarding spoilers! At present the expanded Trek universe is in a period of major upheaval with the finale of Year Five, the Coda miniseries and the continuations of Discovery, Picard and Lower Decks; and the premieres of Prodigy and Strange New Worlds, the advent of new eras in Star Trek Online gaming, as well as other post-55th Anniversary publications. Therefore, please be courteous to other users who may not be aware of current developments by using the {{spoiler}}, {{spoilers}} or {{majorspoiler}} tags when adding new information from sources less than six months old. Also, please do not include details in the summary bar when editing pages and do not anticipate making additions relating to sources not yet in release. 'Thank You

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Memory Beta, non-canon Star Trek Wiki
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Memory Beta, non-canon Star Trek Wiki

A first officer (aka executive officer, XO, and number one) is the second-highest ranking officer aboard a starship or space station after the commanding officer. They take command if the commanding officer is unable to. If the first officer is also unable to take command, the second officer is in charge, followed by the third officer, and so on. On ships assigned to the Starfleet Corps of Engineers, such as the USS da Vinci, the first officer is concurrently the leader of the team.

First officers by name[]

First officers by post[]

First officers by year[]

External link[]

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