The National Democratic Labour Action Society – Wa'ad (Arabic: جمعية العمل الوطني الديمقراطي – وعد, romanized: Jamʻīyat al-ʻAmal al-Waṭanī al-Dīmuqrāṭī – Waʻd, NDAS)[1] is Bahrain's largest leftist political party.

It emerged from the Popular Front for the Liberation of Bahrain, a "radical" clandestine opposition movement of socialist and Arab nationalist orientation.

Historically, the Left in Bahrain had been very strong, partly as a result of the creation of a local working class through the Kingdom's industrialisation with the discovery of oil in the 1930s; however the waning of Arab nationalism, the collapse of communism as an ideology and the rise of the Islamist Right have marginalised the NDLA and robbed it of much of its traditional support.

Despite this, the NDLA's leaders are widely respected and retain a great deal of influence in Bahraini society.

Lynn Maalouf of Amnesty International stated that "the suspension of Waad is a flagrant attack on freedom of expression and association".