14 September - The latest edition of El Diario Ilustrado circulates.
16 September - Inauguration of the Lo Prado tunnel on Route 68, which connects Santiago de Chile with Valparaíso.
26 September - The newspaper El Observador is founded in the city of Quillota.
October
11 October - The Popular Unity accepts the constitutional guarantees proposed by the Christian Democracy as a condition to ratify Salvador Allende as President in the Plenary Congress.
22 October - Attack on the Commander in Chief of the Army, René Schneider. The general dies 3 days later in the Military Hospital.
24 October - The Full Congress ratifies Salvador Allende as the new President of the Republic for the period 1970-1976. The vote was 153 votes for Allende, 35 for Jorge Alessandri and 7 blank.
26 October - Carlos Prats is appointed Commander in Chief of the Army.
28 October - The newspaper La Prensa, belonging to the Journalistic Society of The South, is founded in Santiago and circulated until February 21, 1974.
November
3 November - Salvador Allende assumes the Presidency of the Republic for the period 1970-1976.
5 November - President Salvador Allende makes his first speech at the Estadio Nacional in Santiago emphasizing the objectives of his government by declaring "I make Fidel Castro's phrase mine in this government you can put your feet but never your hands".
6 November - Salvador Allende is ratified by Congress, his first action being to ratify Carlos Prats as Commander in Chief of the Army.
8 November - In the commune of San Miguel the first monument in the world dedicated to Che Guevara is erected.
10 November - Interior Minister José Tohá announces the dissolution of the Carabineros mobile group after decades of existence, this body being replaced by the Prefecture of Special Forces.
12 November - The government of President Salvador Allende reestablishes diplomatic relations with the island of Cuba.
16 November - President Salvador Allende manages to get Chile to establish diplomatic relations with North Korea for the first time.
30 November - National commotion causes the suicide of Antonieta Macchi Bonadey, a 50-year-old woman who was kidnapped by an unknown group of 30 armed peasants who broke into her farm La Tregua near the city of Valdivia in the south of the country.[1][2]
December
1 December - President Salvador Allende signs his first expropriation decree affecting the textual factory Bellavista Oveja Tomé in the town of Bellavista in the commune of Tomé in the north of the city of Concepción, Bío Bío Region.
2 December - Under strange circumstances, Arnoldo Rios Alarcon, a MIR student from the University of Concepción, dies in a confrontation with the Ramona Parra Brigade.
8 December - President Salvador Allende makes a visit to the San Jose de Chuchunco population seeking to convince the residents to abandon the place which had been usurped since October 18 without any success.
23 December - In Valparaíso, the Plaza Salvador Allende is inaugurated next to Parque Italia, at the intersection of Avenida Pedro Montt and Calle Victoria under the name "Plaza del Pueblo".
30 December - President Salvador Allende announces to the country through radio and television the policy of nationalization of the banking system. He would send a bill to Congress the following week to nationalize banking.