Américo Arturo Acuña Rosas (born 2 January 1934) is a Chilean former politician and lawyer who served as President of the Senate of Chile.

[1][2] He began his political activities during his time as a High school student, in which he was president of the Alumni Center of his Lyceum.

[3] Later, he joined the University of Chile School of Law, where he obtained his Bachelor of Arts a degree thesis entitled «Political and Economic Background of the Constitutional Reform in 1934», which content had as context to Arturo Alessandri Palma's second government (1932−1938).

In 1961, Acuña gained a seat in the Chamber of Deputies representing the 23rd Departmental Group of his hometown Osorno and Río Negro for the period 1961−1965.

In 1969, Acuña reached a seat in the Senate representing the 9th Provincial Group of Valdivia, Osorno and Llanquihue for the period 1969−1977.