Demetrius Lacon or Demetrius of Laconia (late 2nd century BC) was an Epicurean philosopher, and a disciple of Protarchus. He was an older contemporary of Zeno of Sidon and a teacher of Philodemus. Sextus Empiricus quotes part of a commentary by Demetrius on Epicurus, where Demetrius interprets Epicurus' statement that « time is an accident of accidents. »
Papyrus scrolls containing portions of the works of Demetrius were discovered at the Villa of the Papyri at Herculaneum. The major works partially preserved are:
In addition, he is the probable author of the following works: