Lerna (Greek: Λέρνα) is a former municipality in Argolis, Peloponnese, Greece. Since the 2011 local government reform it is part of the municipality Argos-Mykines, of which it is a municipal unit. The municipal unit has an area of 84.285 km. The seat of the municipality was Myloi.

Historical population

Year	Population
1991	2,742
2001	3,042
2011	2,319
2021	2,747