Spanish Abstract: El articulo estudia uno de los tres tipos de pruebas a los que debian recurrir tanto los litigantes para probar sus intenciones, como los jueces para averiguar la verdad y dictar su sentencia en un juicio: las declaraciones de los testigos. Se analiza, por consiguiente, el conjunto de reglas que fueron destinadas a garantizar la validez de las declaraciones de los testigos y su correcta valoracion por parte de los jueces. Senalamos que, en esta materia, el derecho canonico giro en torno a tres aspectos principales: la seleccion de los testigos en funcion de su edad, genero, calidad y relaciones de parentesco o amistad/enemistad con las partes, los procedimientos formales para examinar a los testigos y, finalmente, los castigos que incurrian los perjuros. Si bien aquellas normas estuvieron en gran medida inspiradas del derecho castellano, algunas variaciones fueron introducidas en el orden juridico desarrollado en Hispanoamerica y Filipinas entre los siglos XVI y XVIII para atender la cuestion de las distancias, por un lado, y del testimonio indigena, por otro. English Abstract: The paper focuses on one of the three kinds of evidence that litigants were supposed to use to prove their intentions, as well as judges to investigate a case and pronounce their judgement: witness testimonies. We analyze the set of rules that were established to guarantee the validity of the statements, as well as their correct assessment by judges. It will be emphasized that canonical law focused on three basic aspects: the selection of the witnesses according to their age, gender, quality, and relationship to the litigants, the formal procedures used to examine the witnesses and, finally, the punishments for perjuring. Although those norms were in large part inspired by Castilian law, some variations were introduced in Spanish America and the Philippines in order to address the issue of distances, on the one hand, and that of indigenous testimony, on the other.