Thiago Kosloski (born 16 May 1981) is a Brazilian football coach and former player who played as a full back.

[1] He won the Campeonato Paranaense Série Bronze with Telêmaco Borba [pt] in the following year,[2] and later played for Operário Ferroviário, Londrina, Grêmio Barueri, Botafogo-SP, Rio Branco-PR and Grêmio Coariense before signing for Lebanese side Al Ahed in 2007.

Back to his home country in 2008, Kosloski represented Cianorte, Vilhena and Penapolense, retiring with the latter in 2009 at the age of 29.

Shortly after retiring, Kosloski began his coaching career in charge of Olé Brasil's under-17 team.

In the following year, he after being in charge of the under-20 team, he became head coach of the main squad in the 2010 Campeonato Paulista Segunda Divisão in July.