| Ceylon Democratic Party | |
| Native Name: | ශ්රී ලංකා ප්රජාතන්ත්රවාදී පක්ශය |
| Abbreviation: | LPP |
| Founded: | 1960 |
| Successor: | Sri Lanka Freedom Socialist Party |
| Country: | Sri Lanka |
Lanka Prajathanthravadi Pakshaya ('Ceylon Democratic Party') was a political party in Sri Lanka. LPP was led by Dr. Wijeyananda Dahanayake. In the 1960 elections LPP was part of the 'Mahajana Eksath Peramuna' coalition, consisting of the Sri Lanka Freedom Party, Viplavakari Lanka Sama Samaja Party, Jathika Vimukthi Peramuna and LPP.
Ahead of the 1965 elections the link between LPP and SLFP had been broken. LPP won one seat. After the elections LPP gave their support to the United National Party government. Soon thereafter it merged into the Sri Lanka Freedom Socialist Party, which merged into UNP.
| Election year | Votes | Vote % | Seats won | +/– | Government | |
|---|---|---|---|---|---|---|
| 1960 March | 135,138 | 4.44% | ||||
| 1960 July | 30,207 | 0.98% | 2 |