| Honorific-Prefix: | Hon. |
| Lasantha Alagiyawanna | |
| Native Name: | ලසන්ත අලගියවන්න லசந்த அழகியவன்ன |
| Honorific-Suffix: | MP |
| Office: | Deputy Minister of Transport |
| Term Start: | 2004 |
| Term End: | 2007 |
| Office2: | Minister of Road Passenger Transport |
| Term Start2: | 2007 |
| Term End2: | 2010 |
| Office3: | Deputy Minister of Construction, Engineering Services, Housing & Common Amenities |
| Term Start3: | 2010 |
| Term End3: | 12 January 2015 |
| Constituency Mp4: | Gampaha District |
| Parliament4: | Sri Lanka |
| Term Start4: | 2004 |
| Birth Date: | 19 October 1967 |
| Nationality: | Sri Lankan |
| Party: | Sri Lanka Freedom Party |
| Otherparty: | United People's Freedom Alliance |
| Residence: | Meewitigammana, Urapola |
| Profession: | Teacher |
Senanayake Alagiyawanna Mohotti Appuhamillage Lasantha Alagiyawanna (born 19 October 1967), known as Lasantha Alagiyawanna, is a Sri Lankan politician. He is a representative of Gampaha District for the United People's Freedom Alliance in the Parliament of Sri Lanka, and served as the Minister of Road Passenger Transport.