Diet data for haddock (Melanogrammus aeglefinus) were collected from two capelin (Mallotus villosus) spawning areas in Finnmark, Norway, during 2005–2006. Haddock were sampled using bottom trawl, and stomach content analysis was performed to estimate the proportions (wet weight) of various prey groups. The data were obtained and analyzed as part of a PhD project investigating predation on capelin eggs and capelin. These data are presented in the PhD thesis: Mikkelsen, N. (2013). Predation on the demersal fish eggs of capelin Mallotus villosus and lumpsucker Cyclopterus lumpus in relation to recruitment. PhD thesis, Department of Arctic and Marine Biology, Faculty of Biosciences, Fisheries and Economics, University of Tromsoe. UiT The Arctic University of Norway (former University of Tromsoe) funded a Phd-scholarship for the first author (N. Mikkelsen)