Lacon can refer to:
Places:
- Lacon, Alabama
- Lacon, Illinois
- Lacon Township, Marshall County, Illinois
Other:
- Lacon (beetle), a click beetle genus
- Lacon family, a Sardinian dynasty
- Oliver Lacon, a character in John le Carré's novels
- L.A.con (disambiguation), four World Science Fiction Conventions held in Anaheim, California, United States