Alessandro Bastoni Cavaliere OMRI is an Italian professional footballer who plays primarily as a centre-back for Serie A club Inter Milan and the Italy national team. Considered one of the best centre-backs in the world, he is best known for his well-timed tackles, ball playing ability, accurate long passes from the back, and versatility.

Bastoni was born in Casalmaggiore, Lombardy, and began his career in the local Rivarolo Mantovano youth side, where his father was coach. At the age of 7, he joined the youth side of Serie A club Atalanta.

Bastoni has been capped by Italy at every level from U15 to U19. His first international goal came in a 4–0 win over Norway whilst playing for the under-16 team. He was first called up to the under-18 side by coach Paolo Nicolato in August 2016, and was made captain in his second game; a 2–2 draw with the Netherlands. He was called up to the Italy under-19 side by coach Paolo Nicolato on 9 August 2017 at the age of 18.

He made his debut with the Italy U21 team on 11 October 2018, in a friendly match lost 1–0 against Belgium. He became immediately a starter and he took part in the 2019 UEFA European Under-21 Championship on home soil.

A left–footed defender, Bastoni started his career as a full-back, but is also capable of playing as a centre-back, a role in which he became increasingly deployed as his career progressed. He is mainly known for his passing ability and ball control, while his height and ability to exploit spaces allows him to be effective in the air, which makes him a goal threat from indirect set–pieces. Regarded as a promising young player in the media, in 2020, he was included in the list of "Fifty for the future: UEFA.com's ones to watch." Known for his ability to time his challenges and his calmness under pressure, in 2024 he was included in 90min.com's list of "the 25 best centre-backs in world football."

Bastoni's father, Nicola, was also a footballer, who played as a left–back for Cremonese. On 21 January 2022, his long-time partner gave birth to a daughter, who was named Azzurra.