| Official Name: | Municipality of Castro |
| Castro | |
| Settlement Type: | Municipality |
| Seal Size: | 80 |
| Pushpin Map: | Brazil |
| Pushpin Label Position: | bottom |
| Pushpin Map Caption: | Location in Brazil |
| Subdivision Type: | Country |
| Subdivision Name: |  Brazil |
| Subdivision Name1: | South |
| Subdivision Type2: | State |
| Subdivision Type3: | Mesoregion |
| Subdivision Name3: | Centro Oriental Paranaense |
| Unit Pref: | Imperial |
| Population As Of: | 2020 |
| Population Footnotes: | [1] |
| Population Total: | 71,809 |
| Timezone: | UTC -3 |
| Coordinates: | -24.7908°N -50.0119°W |
| Area Code: | 42 |
| Blank Name: | HDI (2010) |
| Blank Info: | 0.703 – high[2] |
Castro is a municipality in the state of Paraná in the Southern Region of Brazil.[3] [4] [5] [6] In 2020 it had a population of 71,809 people. The main road running through the town is the PR-151 road.
The first inhabitants were the indigenous people, Castro was discovered on 19 March 1704, and it became municipality in 1857. In the 1930s, the largest European Immigration happened, they were Dutch, Russians, Italians and Ukrainians.
Castrolanda is a colony that was founded by Dutch immigrants between 1951 and 1954. Testament to this there is a windmill in Castro. Its economy is based on agricultural production and dairy farming which is one of the most important in this region that is considered the largest dairy in Brazil due to their genetic quality. It has a considerable production of grain, mostly soy and beans. Also having one of the largest agricultural cooperatives in Brazil, which bears the name of the colony.
Castro has oceanic climate (Köppen climate classification Cfb), the average temperature on summer is 25°C, on winter the temperature reaches to 11°C, the temperature rarely drops below 5°C or exceeds 15°C. There's occasionally snow fall on winter. Frost are common on winter. The highest temperature was 35°C on 4 January 1949. The lowest temperature was -7°C on 1 August 1955.