Two cases of year-to-year mate fidelity in Chiffchaff occurred in the subpopulation of 6 males and their females in a region of South Bohemia. The first nesting of both females failed in the first season. One of them was secondary female in the first season. Both pairs renested in a new territory in the second season. The nesting of both of them was successful in this season. This is probably the first record of remating between seasons in this species.