Livra runs fully managed online access panels in 12 countries across Central and South America, plus panels in Portugal and Spain.
The news follows TNS's extension of its 6th Dimension Interactive Research services to Latin America, under Trixie Cartwright as regional director.
Mark Walton, TNS regional director for 6th Dimension Interactive Research for Asia-Pacific, Latin America, Middle East and Africa, said: "Livra are the leading online panel provider in Latin America and offer the ideal platform for TNS to deliver a full range of competitively-priced online research services to clients."
Martin Anazco, managing director of Livra, said: "Online research is poised to grow significantly in Latin America and we see great opportunities for Livra, TNS and our clients."