The parliament of the Common Market of the South (Mercosur) approved a declaration on Monday to condemn the coup in Honduras and support ousted President Manuel Zelaya.
The legislature said it would help seek a solution to "guarantee respect for democracy" in Honduras.
The parliament also urged "all political and social actors to retake the path of pacific and democratic dialogue."
The parliament expressed "its strongest condemnation" to Honduran millitary's overthrowing of "a constitutional government."
On Monday noon, the Mercosur parliament held here its 6th extraordinary session to install Juan Dominguez from Uruguay as the rotating chairman of the organization, replacing Ignacio Mendoza from Paraguay.
Mercosur is formed by Argentina, Brazil, Paraguay and Uruguay.