Born in Taranto, Riondino enrolled at the Silvio D'Amico National Academy of Dramatic Art, graduating in 2000.

[1][2] In 2006, he acted in The Black Arrow, a TV series broadcast by Canale 5, directed by Fabrizio Costa.

[2][3] In 2010, Riondino was appointed EFP Shooting Star at the Berlin International Film Festival.

[2] He received the Guglielmo Biraghi Award at the 67th Venice International Film Festival.

[4] He has been playing the title character in the RAI TV-series The Young Montalbano since 2012.