Aku Kauste (born 17 November 1979 in Espoo) is a Finnish curler from Helsinki. He is currently the skip for the national team of Finland. Kauste is one of the most successful curling players in Finland, with over 20 medals in the Finnish Curling Championships (juniors, men's, mixed, mixed doubles).

Kauste started curling in 1994 with his father Timo Kauste. In 1998, Kauste made his first international appearance at the World Junior Curling Championships.

Kauste played in the 2002 and 2003World Curling Championships with Team Finland, skipped by Markku Uusipaavalniemi. He has played in the European Curling Championships four times; in a team skipped by Uusipaavalniemi in 2002, and 2004 in a team skipped by Tomi Rantamäki in 2009, and as skip in 2012 where he won the Group B competitions, promoting Finland to the Group A competitions in 2013.

Kauste skipped Team Finland at the 2012 European Mixed Curling Championship where Finland won bronze. The other players of the medal team were Aku's sister Oona Kauste, Pauli Jäämies and Sanna Puustinen.

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