| Official Name: | Gammaduwa |
| Native Name: | ගම්මඩුව கம்மடுவை |
| Settlement Type: | Village |
| Pushpin Map: | Sri Lanka |
| Pushpin Label Position: | bottom |
| Subdivision Type: | Country |
| Subdivision Name: | Sri Lanka |
| Subdivision Name1: | Central Province |
| Subdivision Type2: | District |
| Unit Pref: | Imperial |
| Population Total: | 5,294 |
| Population Density Km2: | 532 |
| Timezone: | Sri Lanka Standard Time |
| Utc Offset: | +5:00 |
| Coordinates: | 7.5721°N 80.7004°W |
| Elevation M: | 750 |
| Website: | 9 |
Gammaduwa is a village in Sri Lanka. It is located within Matale District, Central Province with a picturesque landscape and temperate climate. It is situated at an elevation of 931 m (3,054 ft) above sea level. The area is mildly densely populated with 532 people per km2. The population of the village, according to the 2018 census, was 5,294. Matale is the nearest city and takes about 1:20 hour by local transportation.
Gammaduwa is governed by Ambanganga Korale Pradeshiya Sabha.
April is warmest with an average temperature of 28.4 °C at noon. February is coldest with an average temperature of 15.5 °C at night. Gammaduwa has n307o distinct temperature seasons, the temperature is relatively constant during the year. The temperatures at night are cooler than during daytime. March is on average the month with most sunshine. The wet season has a rainfall peak around September, the dry season is around the month of February.