| First Name | John |
| Last Name | Karlen |
| Full Name at Birth | John Adam Karlewicz |
| Age | 78 |
| Date of Birth | May 28, 1933 |
| Birthplace | New York City, New York, U.S. |
| Height | 5' 10" (178 cm) |
| Build | Average |
| Hair Color | Grey |
| Star Sign | Gemini |
| Ethnicity | White |
| Nationality | American |
| Occupation | Actor |
| Occupation Category | Actor |
| Claim to Fame | Dark Shadows, Cagney & Lacey |
John Karlen (born John Adam Karlewicz on May 28, 1933) is a character actor best known for playing Willie Loomis, Carl Collins, William H. Loomis, Desmond Collins, and Kendrick Young on the ABC serial Dark Shadows, in various episodes between 206 and 1245, which aired from 1966-1971. In 1971 Karlen starred as the male lead in "Daughters of Darkness". He also starred in the 1975 television film, Trilogy of Terror, and was in the movie Killer's Delight.
Selected John Karlen film and TV show credits: