The Ghadar Party (Hindustani: ग़दर पार्टी (Devanagari), غدر پارٹی (Nastaleeq); Punjabi: ਗ਼ਦਰ ਪਾਰਟੀ) was an organization founded by Punjabi Indians, in the United States and Canada with the aim to liberate India from British rule. The movement began with a group of immigrants known as the Hindustani Workers of the Pacific Coast.

After the outbreak of World War I, Ghadar party members returned to Punjab to agitate for rebellion alongside the Babbar Akali Movement. In 1915 they conducted revolutionary activities in central Punjab and attempted to organize uprisings but their attempts were crushed by the British Government. After the conclusion of the war, the party in America split into Communist and Anti-Communist factions. The party was formally dissolved in 1948.

Ghadar is an Urdu/Punjabi word derived from Arabic which means "revolt" or "rebellion." As Kartar Singh Sarabha, one of the founders of the party, wrote in the first issue: "Today there begins 'Ghadar' in foreign lands, but in our country's tongue, a war against the British Raj. What is our name? Ghadar. What is our work? Ghadar. Where will be the Revolution? In India. The time will soon come when rifles and blood will take the place of pens and ink."