| Ostrá Lúka | |
| Settlement Type: | Municipality |
| Pushpin Map: | Slovakia#Slovakia Banská Bystrica Region |
| Pushpin Map Caption: | Location of Ostrá Lúka in Slovakia. |
| Pushpin Label Position: | top |
| Subdivision Type: | Country |
| Subdivision Name: |  Slovakia |
| Subdivision Type1: | Region |
| Subdivision Name1: | Banská Bystrica Region |
| Subdivision Type2: | District |
| Subdivision Name2: | Zvolen District |
| Government Footnotes: | [1] |
| Leader Party: | Independent |
| Leader Title: | Mayor |
| Leader Name: | Juraj Jelok |
| Unit Pref: | Metric |
| Area Footnotes: | [2] |
| Area Total Km2: | 20.27 |
| Population Footnotes: | [3] |
| Population As Of: | 2021 |
| Population Total: | 305 |
| Population Density Km2: | auto |
| Timezone1: | CET |
| Utc Offset1: | +1 |
| Timezone1 Dst: | CEST |
| Utc Offset1 Dst: | +2 |
| Postal Code Type: | Postal code |
| Postal Code: | 962 61 |
| Area Code: | +421-45 |
Ostrá Lúka (hu|Osztroluka) is a village and municipality of the Zvolen District in the Banská Bystrica Region of Slovakia.
In 2024, the remains of a medieval church dating from the 13th century was found at Ostrá Lúka. A geophysical survey revealed the church's floor plan, including its rectangular nave, presbytery, and sacristy added in the 14th century, as well as a crypt and later fortification wall that surrounded the church and cemetery.[4]
Before the establishment of independent Czechoslovakia in 1918, Ostrá Lúka was part of Zólyom County within the Kingdom of Hungary. From 1939 to 1945, it was part of the Slovak Republic.