Objective: To study the association between dinner eating location and the nutritional quality of the specific dinner meal and the whole-day dietary intake and to compare the diets of those consuming $25 % of energy out of home and at school/work (SOH; substantial out-of-home eaters) with those consuming ,25 % of energy out (NSOH; non-substantial out-of-home eaters). Design: Cross-sectional dietary survey using two non-consecutive 24 h recalls. Recorded eating locations were at home, other private households, work/school, restaurant/cafeteria/fast-food outlet and travel/meeting. Setting: Nationwide, Norway (2010)(2011). Subjects: Adults aged 18-70 years (n 1746). Results: Dinners at restaurants and other private households were higher in energy than home dinners (P , 0?01). Restaurant dinners contained less fibre (g/MJ; P , 0?01) and had a higher percentage of alcohol consumers (P , 0?05), while dinners at other private households had a higher percentage of energy from sugar (P , 0?001) and a higher percentage of consumers of sugar-sweetened beverages (P , 0?05) than home dinners. Most differences between dinners consumed at different eating locations were also observed in dietary intakes for the whole day. SOH-eaters had a higher energy intake (P , 0?01), a higher percentage of energy from sugar (P , 0?01) and a lower fibre intake (P , 0?01) than NSOH-eaters. The percentages of consumers of alcohol and sugar-sweetened beverages were higher (P , 0?01) among SOH-eaters. Conclusions: Dinner eating location was significantly associated with the nutritional quality of the diet, both for the specific dinner meal and for whole-day intake. Our data generally point to healthier dinners being consumed at home. SOH-eaters had a less favourable dietary intake than NSOH-eaters.