Olecko | |
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 Flag  Coat of arms | |
  Olecko | |
| Coordinates: 54°2′N 22°30′E / 54.033°N 22.500°E | |
| Country |  Poland |
| Voivodeship |  Warmian-Masurian |
| County | Olecko |
| Gmina | Olecko |
| Established | 16th century |
| Town rights | 1560 |
| Government | |
| • Mayor | Karol Sobczak |
| Area | |
| • Total | 11.6 km2 (4.5 sq mi) |
| Population (2011) | |
| • Total | 22,384 |
| • Density | 1,900/km2 (5,000/sq mi) |
| Time zone | UTC+1 (CET) |
| • Summer (DST) | UTC+2 (CEST) |
| Postal code | 19-400 to 19-402 |
| Area code | +48 87 |
| Car plates | NOE, NOG |
| National roads |  |
| Voivodeship roads |   |
| Website | http://www.olecko.pl |
Olecko [ɔˈlɛt͡skɔ] (former German: since 1560, colloquially also , since 1928) is a town in northeastern Poland. It is in Masuria, near Ełk and Suwałki, in the Warmian-Masurian Voivodeship. It is at the mouth of the Lega river which flows into the Great Olecko Lake (Jezioro Oleckie Wielkie) on its southwestern shore. Olecko is the seat of Olecko County.