For the mirror universe counterpart, please see C. Sweeny (mirror).
C. Sweeny was a Starfleet officer in the 23rd century.
Sweeny was listed as a Starfleet Command officer on the dedication plaques of the USS Shenzhou and the USS Discovery. (DIS: "The Vulcan Hello", dedication plaque; DIS: "Context Is for Kings", dedication plaque)
This character was only mentioned in writing.
This officer was named after the writer and consulting producer Craig Sweeny.