Summernationals (also style SummerNationals) may refer to:
- New England Summer Nationals
- UMP DIRTcar Summer Nationals; see United Midwestern Promoters
- AHRA SummerNationals; see American Hot Rod Association
- NHRA Summernationals
- USS Summer Nationals; see United States Swimming National Championships
- Summer Nationals (EP), a covers EP by The Offspring