Augusto Ernesto dos Santos Silva GCL GCC (born 20 August 1956) is a Portuguese sociologist, university professor, and politician who served as the President of the Assembly of the Republic between 2022 and 2024, in the 15th Legislature.

Silva started his political activity while at university, serving as a member of the Porto committee of the Workers' Revolutionary Union, a Trotskyist group aligned with the Internationalist Communist League.

[4][5] In domestic and international deal-making, Santos Silva and Costa are widely seen as astute negotiators, having been building close ties with other Southern European governments during their time in office.

[6] In a diplomatic row over Venezuela's jailing of Portuguese supermarket managers on charges of gouging food prices, Silva summoned the Venezuelan ambassador to Lisbon in September 2018 and demanded that the problem be resolved swiftly.

[7] In 2020, Santos Silva categorically ruled out joining the so-called 17+1 group of eastern and south-eastern European countries that co-operate on China’s Belt and Road Initiative (BRI), saying this was “not Portugal’s geopolitical space”.