The Jemdet Nasr period is an archaeological culture in southern Mesopotamia (modern-day Iraq) that is generally dated to 3100–2900 BCE.

It is named after the type-site Jemdet Nasr, where the assemblage typical for this period was first recognized.

Its geographical distribution is limited to south–central Iraq.

The culture of the proto-historical Jemdet Nasr period is a local development out of the preceding Uruk period and continues into the Early Dynastic I period.