Karlijn Petri (born 5 November 1978) is a retired field hockey player from the Netherlands.
Petri was born and raised in Maassluis.
Throughout her club career, she represented VMHC Pollux, Rotterdam and HV Victoria.
Petri made her international debut for the Netherlands in 1998. She earned her first senior cap in a test match against Japan in The Hague, scoring two goals on debut.
Throughout her senior career, she represented the national team at four major tournaments, winning medals at each of them. She took home gold at the 1999 EuroHockey Championship in Cologne, and silver medals at the 1999 and 2001 editions of the FIH Champions Trophy in Brisbane and Amstelveen, as well as the 2002 FIH World Cup in Perth.
Following the 2002 FIH World Cup, she retired from international hockey.