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Portuguese Democratic Labour Party (in Portuguese: Partido Trabalhista Democrático Português) was a centre-left political party in Portugal. PTDP was founded on 3 May 1974, the first political party to be formed after the Carnation Revolution. PTDP didn't make much impact however, and the party was never legally registered.

v t e Defunct political parties in Portugal
Constitutional Monarchy (1834–1910)	Cartista Constituent Party Historic Party Liberal Regenerator Party Miguelist Portuguese Republican Party Portuguese Socialist Party Progressive Dissidence Progressive Party Reformist Party Regenerator Party Setembrismo
First Republic (1910–1926)	Catholic Centre Party Democratic Leftwing Republican Party Democratic Party Evolutionist Party Integralismo Lusitano Causa Monárquica National Republican Party Nationalist Republican Party Reconstitution Party Regionalist Party Republican Liberal Party Republican Union Union of Economic Interests
Ditadura Nacional (1926–1933)	National Syndicalists
Estado Novo (1933–1974)	Movement of Democratic Unity Movement of National Antifascist Unity National Union Portuguese Marxist–Leninist Committee Portuguese National Liberation Front Revolutionary Party of the Proletariat - Revolutionary Brigades
Third Republic (1974–)	Christian Democratic Party Communist Electoral Front Communist Party (Reconstructed) Communist Party of Portugal (Marxist–Leninist) Democratic Party of the Atlantic Democratic Renewal Party Hope for Portugal Movement Humanist Party Independent Movement for the National Reconstruction / Party of the Portuguese Right Internationalist Communist League Left-wing Union for the Socialist Democracy Left Revolutionary Front Marxist–Leninist Committee of Portugal Movement for the Sick Movement of Socialist Left National Solidarity Party New Democracy Party People's Socialist Front Politics XXI Popular Democratic Union Popular Unity Party Portuguese Democratic Labour Party Portuguese Democratic Movement Portuguese Marxist–Leninist Communist Organization Revolutionary Socialist Party Worker–Peasant Alliance Workers Politics Communist Organisation Workers' Revolutionary Party