Socialist Party of the Oppressed (Turkish: Ezilenlerin Sosyalist Partisi, ESP; Kurdish: Partiya Sosyalîst a Bindestan, PSB)[3] is a Marxist-Leninist political party in the Republic of Turkey.

It defines itself as "a militant revolutionary socialist party fighting for a workers'-labourers' federative republic in Turkey and Northern Kurdistan.

"[4] Some sources, including the public officials, hold the view that ESP is a legal front for the banned ICOR affiliate Marxist–Leninist Communist Party.

[9] In 2013 The Daily Telegraph called it "a small leftist group" after the homes of 90 ESP members were raided in connection with their involvement in the 2013 protests in Turkey.

[10] The Telegraph noted that "Police also searched the offices of the Atilim daily [Atılım] and the Etkin news agency, local media outlets linked to the ESP group, the NTV and CNN-Turk television stations reported.