Left and Democrats (Polish: Lewica i Demokraci, LiD) was a centre-left electoral alliance of political parties in Poland which was created on 3 September 2006, before the Warsaw municipal election of 2006.

The coalition's aim was to provide an alternative for both Law and Justice and Civic Platform, which have been Poland's two major political parties since 2005.

On 15 September 2006 the Coalition Election Committee was officially appointed under the name of "SLD+SdPl+PD+UP – Lewica i Demokraci" (containing the abbreviations for all the member parties as well as the name 'Leftists and Democrats').

The September 2006 Agreement that founded the coalition accused the then incumbent government, led by the Law and Justice party, of causing an erosion of democracy in Poland.

Following the elections, LiD was not invited to participate in the coalition of the victorious Civic Platform with the agrarian Polish People's Party (PSL).

Whilst the social democrats were largely opposed to the proposed Missile Defence system project under negotiation between Poland and the U.S, the PD supported the move.

The left also supported more liberal abortion laws and a more critical position of the Roman Catholic Church in Poland, whilst the PD had concerns with this direction.