Arturo Néstor Alonso Tellechea (born 6 August 1983) is a Spanish sailor.
Arturo Alonso sails in the 49er class together with his older brother, Federico Alonso. They won the silver medal at the 2008 European Championships, the gold medal at the 2009 ISAF Sailing World Cup, and the bronze medal at the 2015 World Championships.