Mark Johnson
- Full Name: Mark Hobbes William Johnson (VOY Novel: Mosaic)
- Born: c.2334 (VOY Novel: Mosaic)
- Species: Human
- Gender: Male
- Fiancee: Kathryn Janeway (2371)
- Engagement ended upon presumed death of Kathryn Janeway following the loss of USS Voyager in the Delta Quadrant (VOY: "Hunters")
- By 2344: Resident; Indiana, United States of America, Earth (VOY Novel: Mosaic)
- By 2353: Student, Indiana University (VOY Novel: Mosaic)
- By 2359: Member, Questor Group (VOY Novel: Mosaic)
- By 2371: Botanist and horticulturist (VOY Short Story: "Letting Go"; VOY Novel: Homecoming)