| Weerasinghe de Silva | |
| Order: | Member of Parliament |
| Constituency Mp: | Balapitiya |
| Parliament: | Sri Lankan |
| Term Start: | 1970 |
| Term End: | 1977 |
| Predecessor: | L. C. de Silva |
| Successor: | Norman Waidyaratna |
| Birth Name: | Pettagan Dedreck Weerasingha de Silva |
| Birth Date: | 21 January 1935[1] |
| Birth Place: | Balapitiya, Sri Lanka |
| Death Date: | November 2006 |
| Death Place: | Colombo, Sri Lanka |
| Nationality: | Sri Lankan |
| Party: | Lanka Sama Samaja Party |
| Occupation: | Politics |
| Alma Mater: | Siddharta Maha Vidyalaya, Balapitiya Nalanda College Colombo |
| Profession: | Lawyer |
Pettagan Dedreck Weerasingha de Silva (21 January 1935 - November 2006) was a Sri Lankan politician and a former MP who represented the seat of Balapitiya.
De Silva was the nephew of Dr. Colvin R. de Silva, his younger brother was Asoka Weerasinghe de Silva and his brother-in-law was Sarath Muthetuwegama.
He was educated at Siddharta Maha Vidyalaya Balapitiya[2] for primary education and then received secondary education from Nalanda College Colombo before entering the Law College, where he passed out as a Senior Counselor.[3]
At the 1970 general parliamentary elections he successfully contested the seat of Balapitiya, as part of the United Front, winning by over 8,000 votes.[4] At the next parliamentary elections in 1977 he was defeated by almost 9,000 votes by the United National Party's candidate, Norman Waidyaratna.[5]