Krzysztof Cwalina (born 5 February 1971 in Wrocław, Dolnośląskie) is a retired freestyle swimmer from Poland. He competed for his native country at the 1992 Summer Olympics in Barcelona, Spain, finishing in eighteenth place in the men's 50 m freestyle event (23.20).
Cwalina graduated with a B.S. and an M.S. in computer science from the University of Iowa. he is a program manager on the Common Language Runtime team at Microsoft Corporation. He and Brad Abrams coauthored Framework Design Guidelines (Addison-Wesley, 2005; 2nd 2008, ), winner of a Jolt Award in 2006.
His son, Alan, is a professional League of Legends esports player under the name Busio.
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