This volume contains the proceedings of the 10th International Symposium on Functional and LogicProgramming(FLOPS 2010), held in Sendai, Japan, April 19 21, 2010 at Aoba Memorial Hall, Tohoku University. FLOPS is a forum for research on all issues concerning declarative progr- ming, including functional programming and logic programming, and aims to promotecross-fertilizationand integrationbetween the two paradigms.The p- vious FLOPS meetings were held in Fuji Susono (1995), Shonan Village (1996), Kyoto (1998), Tsukuba (1999), Tokyo (2001), Aizu (2002), Nara (2004), Fuji Susono (2006), and...