Aeroclube de Rio Negrinho Airport (ICAO: SILN) is a small general aviation facility located in Rio Negrinho, a municipality in the state of Santa Catarina, southern Brazil. It is operated by the local aeroclube and primarily serves private pilots, flight training, and recreational aviation activities. The airport does not handle scheduled commercial passenger services and has no IATA code assigned. It is typical of the many aeroclube-operated airstrips found throughout Brazil, supporting local aviation culture and pilot training programs in the region.