Linseed (Linum usitatissimum L.) is one of the most important oil crops of Ethiopia and it is considered as the main food crop and the least expensive source of oil for the farmers in many highlands of the country. A study on adaptation of improved linseed varieties were carried out at Kefa and Benchi Maji, Shesheonde and Semenbench respectively with the objective of testing the adaptability of linseed varieties for seed yield. Thirteen improved linseed varieties were used for investigation (Yadano, Chilallo, Kassa-2, Belay 96, Berene, Tolle, Jeldu, Bekelecho, Kul-1, Kumo, Furtu, CI-1525 and CI-1652) and one local check were sown in randomized complete block design with three replications from July to December in 2018 in cropping season. Combined analysis of data from the two locations revealed that there is significant difference among varieties for days to maturity, plant height (cm), number of branches per plant, number of capsules per plant, thousand seed weight (gm) and seed yield in kg ha-1. Significant effect of location was observed in all parameters except for thousand seed weight. The interaction of Variety X location was significant for days to maturity, number of branches per plant and number of capsules per plant. The maximum seed yield was recorded in varieties Furtu (1817.02 kg ha-1), Kumo (1752.91 kg ha-1) and Bekelecho (1607.36 kg ha-1). Lowest yield (736 kg/ha-1) was obtained from local check. Variety Furtu and Kumo showed consistence performance in across testing locations to enhance production.