- Distant cousin of poet Joyce Kilmer.
- Attended Chatsworth High School with Kevin Spacey and Mare Winningham; Winningham and Kilmer dated during their teens.
- Started acting in commercials at age 12, and at 17, was one of the youngest students ever accepted to Juilliard's drama school.
- Made his Broadway debut in a 1983 production of John Byrne's The Slab Boys with Sean Penn and Kevin Bacon.
- Did his own singing when he played Jim Morrison in Oliver Stone's The Doors (1991).
- Voiced KITT in NBC's 2008 Knight Rider reboot.
- Enjoys being outdoors; goes fishing, hiking and horseback riding in his spare time.
- In 2010, appeared in character as Mark Twain at Boston's Mary Baker Eddy Library, in connection with Kilmer's work on a film on the life of Eddy, who founded Christian Science, and Eddy's link to Twain. His appearance drew the library's largest crowd up to that time.
- Senga — Stepmother
- Mercedes — Daughter
- Gladys Kilmer — Mother
- Jack — Son
- Joanne Whalley — Ex-wife
- Mark Kilmer — Brother
- Eugene Kilmer — Father
- Wesley Kilmer — Brother
- The Juilliard School, New York, New York, United States
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