John Augustine Swaddock was a Starfleet captain. Swaddock commanded the USS Sacajawea.

In 2385, Swaddock was the recent recipient of a promotion to captain and the command of the Sacagawea. In that year, Jefferson Blackmer contacted Captain Swaddock and asked him to bring the Sacagawea to protect Bajor from an approaching Changeling entity (actually the Link between Taran'atar and the Ascendants). Ro Laren, who had seniority over Swaddock, later asked him to help protect Deep Space 9. (DS9 novel: Ascendance)

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