| Ratmalana | |
| Native Name: | Sinhala; Sinhalese: රත්මලාන Tamil: இரத்மலானை |
| Settlement Type: | Suburb |
| Pushpin Map: | Sri Lanka Colombo District |
| Pushpin Label Position: | above |
| Pushpin Map Caption: | Location in Sri Lanka |
| Subdivision Type: | Country |
| Subdivision Name: | Sri Lanka |
| Subdivision Type1: | Province |
| Subdivision Name1: | Western Province |
| Subdivision Type2: | District |
| Subdivision Name2: | Colombo District |
| Unit Pref: | Metric |
| Area Total Km2: | 13.0 |
| Population As Of: | 2012-03-20 |
| Population Total: | 95,506 |
| Population Blank1 Title: | Ethnicities |
| Timezone: | SLST |
| Utc Offset: | +5.30 |
| Coordinates: | 6.8219°N 79.8861°W |
| Postal Code Type: | Postal code |
| Area Code: | 011 |
Ratmalana is a suburb in Colombo District, Western Province, Sri Lanka. It is inside the administration boundary of Dehiwala-Mount Lavinia Municipal Council. Ratmalana is situated 14.6 km south of Colombo city centre. Ratmalana Airport located here was the country's first and main international airport until the inauguration of Bandaranaike International Airport, Katunayake in 1967. Ratmalana is also the birthplace of Sir John Kotelawala, the third Prime Minister of Sri Lanka (then Ceylon) elected in 1953.
Maliban Biscuit Manufactories, one of the largest manufacturers, distributors and marketers of bakery products in Sri Lanka, is headquartered in Ratmalana.