Since 1969, the ARITH symposia have served as the primary and reference conference for presenting scientific work on the latest research in computer arithmetic. The topics of the conference include theoretical aspects, number systems, algorithms for operations and math functions, implementations, validation, and applications of computer arithmetic. Since 1981, the ARITH symposia have been a biennial event. They will be an annual event starting from 2015. See the archives page for more information on previous symposia. This 22nd edition of the conference will take place from Monday, June 22nd, to Wednesday, June 24th, 2015, at école Normale Supérieure de Lyon, France.