| Janjina | |
| Official Name: | Općina Janjina |
| Settlement Type: | Municipality |
| Pushpin Map: | Croatia |
| Pushpin Label Position: | left |
| Coordinates: | 42.9167°N 42°W |
| Subdivision Type: | Country |
| Subdivision Name: | Croatia |
| Subdivision Type1: | County |
| Subdivision Name1: | Dubrovnik–Neretva |
| Leader Title: | Municipal mayor |
| Leader Name: | Vlatko Mratović (HDZ) |
| Area Footnotes: | [1] |
| Area Total Km2: | 30.1 |
| Area Urban Km2: | 6.9 |
| Population As Of: | 2021 |
| Population Total: | 522 |
| Population Density Km2: | auto |
| Population Urban: | 185 |
| Population Density Urban Km2: | auto |
| Timezone: | CET |
| Timezone Dst: | CEST |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
| Postal Code Type: | Postal code |
| Postal Code: | 20246 |
| Area Code: | 020 |
Janjina (Italian: Iagnina) is a village and a municipality located right in the center of the Pelješac peninsula, in the Dubrovnik-Neretva County, Croatia.
The village of Janjina includes a tiny fishing harbor and a hamlet called Zabreže (Behind the hill), the name describing its geographic situation. It is divided into five parts: Gornje Selo (The Upper Village) comprising Lovrovići, which together with Bara are known to exist from the 4th century AD. Jaspričići, Prišlići and Dežulovići seem to have been established between the 15th and 16th century.
The meaning of Janjina remains uncertain, but the local belief is that it derives from the female Christian name Janja, a Slavic form of the Hebrew Johanna. The oldest written records about Janjina date back from 1222 AD.
According to the 2021 census, its population was 522 with 185 living in the town proper.
According to the 2001 census there were 593 people living in the municipality of Janjina, and the absolute majority are Croats (97.65%).
The villages and the respective populations are:
The municipality was created in 1997, previously this area was part of the Ston municipality.