Sebastião Barroso Lazaroni,^[1] (born 25 September 1950^[1]) is a Brazilian football manager who last coached Qatar Stars League club Qatar SC.^[2] He was born in Muriaé, Minas Gerais state.^[1]

He is well known in Brazil as the manager who tried to introduce the libero position in Brazilian football.^[3] He used the 3–5–2 scheme during the 1990 FIFA World Cup, but it was a failure, and Brazil was eliminated in the second round by Argentina.^[3]

When he was the Brazil national team head coach, in 35 matches, he won 21, drew seven and lost seven.^[3]

He helped Brazil win the South American Championship in 1989, the team's first Copa América title in 39 years.

He is also known for his being the head coach of Turkish club Fenerbahçe that ended the 40-year undefeated European home record of Manchester United in the UEFA Champions' League match in 1996.^[4]

He took over the Qatar national team on 1 August 2011 as a replacement for Milovan Rajevac, but was ultimately fired four months later as a result of the team's unimpressive performances. The QFA highlighted his failure to advance past the group stage of the 2011 Pan Arab Games, which Qatar had hosted, as a main cause of his sacking. His record with the team ended with two wins, five draws and two losses.^[5] He was officially sacked on 3 January 2012 after his contract was released by QFA.

Lazaroni was last in charge of Qatar SC for the third time in his career following spells with the Doha based club between 2008 and 2011 and 2012 and 2014.^[2] His third spell ended in disappointment and he was dismissed in May 2016 after the club's relegation from Qatar Stars League.