The Party of Democratic Socialism (PDS) is a political party in West Bengal in India. The PDS was founded in February 2001 by expelled Communist Party of India (Marxist) (CPI(M)) leader Saifuddin Chaudhury. The PDS is in opposition to the Left Front government in West Bengal, and they have aligned themselves with the Indian National Congress.
Initially there was speculation that the PDS would joint with the All India Trinamool Congress, or else that it would be a constituent of an anti-CPI(M) mahajot (broad front), but the link between Trinamool and the Hindu rightist BJP hindered such a development.
Ahead of the West Bengal state assembly elections in 2001, the PDS had launched their own front. The PDS put up 98 candidates, who together got 219,082 votes (0.6% of the votes in the state). None of their candidates were elected.
The flag of the PDS is a red flag with a red star in a white circle.
The women's organization of the PDS is called Paschim Banga Nari Sanghati Samiti (West Bengal Women's United Association). The president of PBNSS is Kishwar Jahan.
The PDS publishes Natun Path (New Way).