Charles Lefler (also known as Mark Lefler) was a human male in Starfleet in the 24th century.

Lefler was a plasma specialist, and as such was assigned to a variety of postings, usually for periods of less than a year. In the course of his career, he worked at such locations as Coridan III, Starbase 42, Tantalus, Rimbor, Utopia Planitia, Starbase 179, Starbase 212, and Gemaris V.

Sometime prior to 2345, he married Morgan Primus, and in 2345, they had a daughter, Robin.

In 2354, Morgan began leaving Charles and their daughter for weeks at a time, putting a tremendous strain on their marriage. After nine years of this, in the summer of 2363, Morgan revealed to Charles that she was an immortal, incapable of dying. This revelation repelled Charles, and his reaction sent Morgan into depression. Several days later, Morgan apparently died in a shuttlecraft crash off the New Jersey shore.

Lefler took an extended leave of absence from Starfleet following the loss of his wife. (NF short story: "Lefler's Logs", "Alice, on the Edge of Night")

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