28 February - The 1945 South American Championship current Copa América, ends; Argentina is crowned champion, second place goes to Brazil, followed by Chile in third place, and Uruguay in fourth place.
15 May - The senators and deputies elected in the election of March 4 take office for the period May 15, 1945 - May 15, 1949.
20 May - The 3rd edition of the Championship of Champions ends, Colo-Colo is crowned champion of the championship.
June
19 June – 1945 El Teniente mining accident;355 workers die from carbon monoxide emissions. It is considered the largest accident in a metallurgical mine in the world.