Left Democratic Alliance is an alliance of six political parties flagging the left-wing political ideology of Bangladesh. Out of these six parties, two parties - CPB and SPB (Basad) are registered by Bangladesh Election Commission. The remaining four parties are not registered.

On July 18, 2018, the formation of this alliance was announced in a press conference at the temporary office of the alliance at Mukti Bhaban in Paltan of the capital.^[1] At the time of its formation, the coalition consisted of eight parties. Subsequently, on 24 May 2022, the membership of the Ganosamhati Andolan and Revolutionary Workers Party was suspended.^[2]

Democratic Left Front was formed around 2013. In continuation of that front, this alliance was newly formed in 2018.

The alliance was formed by eight left-wing parties^[3] and currently consists of six.