The Gambela Peoples’ Democratic Movement (GPDM, Amharic: የጋምቤላ ሕዝቦች ዴሞክራሲያዊ ንቅናቄ, romanized: Yä-Gambella Həzbočč Demokrasiyawi Nəqnaqe), also known as the Gambela People’s Democratic Movement[1] or Gambella Peoples’ Unity Democratic Movement (Amharic: ጋምቤላ ሕዝቦች አንድነት ዴሞክራሲያዊ ንቅናቄ, romanized: Gambälla Həzbočč Andinet Demokrasiyawi Nəqnaqe, GPUDM),[2][3] was a political party in the Gambela Region of Ethiopia.

[4] This group launched a guerrilla war against both the Derg regime of Ethiopia and the Sudan People's Liberation Army (SPLA).

The latter had a major base in Gambela and had committed numerous atrocities against the local inhabitants; however the GPLM was unable to mobilize more than a negligible portion of the population and never held any liberated area before the fall of the Derg in 1991.

Now in power, the GPLM removed the predominantly Nuer leadership that had dominated the province under the Derg, as well as settling old scores with its ethnic rival.

In response, the Nuer organized the Gambela People's Democratic Unity Party (GPDUP), which was immediately recognised by the EPRDF.