Loneliness is a complex and usually unpleasant emotional response to isolation or lack of companionship.
Loneliness may also refer to:
- "Loneliness" (short story), a short-story by Charles Bukowski
- Loneliness (album), a 2009 album by Evan Yo
- Loneliness, a 1988 album by Sanchez
- "Loneliness" (song), a song by the German DJ Tomcraft
- "Loneliness", a song by Helen Reddy from Free and Easy
- "Loneliness", a song by Flobots from The Circle in the Square
- "Loneliness", a song by Robert Forster from Warm Nights