1st Plurinational Legislative Assembly of Bolivia

The 2010–2015 Plurinational Legislative Assembly of Bolivia was the first class of the Bolivian legislature, also known as the Plurinational Legislative Assembly, to go by that name. The Assembly was controlled in both houses by the governing Movement for Socialism (MAS-IPSP), elected with a 2/3 supermajority, although some members later separated themselves from the majority. Just four incumbent members of the 2005–2010 Congress returned: Deputy Antonio Franco; Deputy Javier Zabaleta (MAS-IPSP/MSM); Senator René Martínez (MAS-IPSP), who was a deputy; and Senator Róger Pinto, previously of Podemos and now representing PPB-CN.

The Assembly was elected as part of general elections on 9 December 2009. After the votes were counted, party strengths in Congress were as follows:

As part of a break between the MAS-IPSP and its ally the Without Fear Movement (MSM), the latter party's four deputies, elected on the MAS slate pledged in late March 2010, "to act in accord with our political identity, with our conscience, and with the people who elected us with their vote." Consequently, MAS-IPSP had 84 members in the Chambers of Deputies, while the MSM has four. However, two MSM deputies re-affiliated with the MAS-IPSP. In late 2011, at least five indigenous deputies distanced themselves from the MAS-IPSP and announced the formation of an Indigenous Bloc in the Assembly, independent of the MAS. While the Assembly's leadership has yet to officially recognize these two defections, the MAS now controls less than two-thirds of all Assembly seats.