| Official Name: | Kolonnawa |
| Native Name: | කොළොන්නාව கொலன்னாவ |
| Settlement Type: | town |
| Pushpin Map: | Sri Lanka Colombo District |
| Pushpin Label Position: | above |
| Pushpin Map Caption: | Location in Colombo District |
| Subdivision Type: | Country |
| Subdivision Name: | Sri Lanka |
| Subdivision Type1: | Province |
| Subdivision Name1: | Western Province |
| Subdivision Type2: | District |
| Subdivision Name2: | Colombo District |
| Unit Pref: | Metric |
| Population As Of: | 2012[1] |
| Population Total: | 64,887 |
| Population Blank1 Title: | Ethnicities |
| Timezone: | +5.30 |
| Coordinates: | 6.9283°N 79.895°W |
Kolonnawa (si|කොලොන්නාව, ta|கொலன்னாவ) is a town located on the eastern boundary of Colombo, Sri Lanka. It is bounded by Kelani River to the north, Kotikawatta-Mulleriyawa Pradeshiya Sabha to the east, Kotte Municipal Council to the south and Colombo Municipal Council to the west.
Kolonnawa Municipality area is a multi-ethnic, multi-religious urban centre. According to the census of 2012, the demographics by ethnicity and religion are as follows:
| 2012 | Percentage | |||
|---|---|---|---|---|
| Buddhist | 123,225 | 64.58% | ||
| Islam | 43,988 | 23.05% | ||
| Hindu | 12,991 | 6.81% | ||
| Roman Catholic | 7,327 | 3.84% | ||
| Other Christian | 3,245 | 1.70% | ||
| Other | 41 | 0.02% | ||
| align=left style="background: #99CCFF;" | Total | 190,817 | 100.00% | |
| Sinhalese | 128,623 | 67.41% | ||
| Sri Lankan Moor | 40,412 | 21.18% | ||
| Sri Lankan Tamil | 15,934 | 8.35% | ||
| Indian Tamil | 2,101 | 1.10% | ||
| Malay | 1,885 | 0.99% | ||
| Burgher | 1,301 | 0.68% | ||
| Other | 487 | 0.26% | ||
| Sri Lankan Chetty | 57 | 0.03% | ||
| Baratha | 17 | 0.01% | ||
| align=left style="background: #99CCFF;" | Total | 190,817 | 100.00% |