In this paper 33 species of brown algae (Ectocarpaceae 20, Pylaiellaceae 1, Chordariaceae 9, Elachistaceae 2 and 1 Giraudiaceae) collected along the coast of the East Aegean Sea, Turkey, are reported. Six species are new to Turkey: Hincksia ovata (Kjellman) P.C. Silva, Phaeostroma bertholdii Kuckuck, Streblonema cf. parasiticum (Sauvageau) De Toni, Elachista fucicola (Velley) Areschoug, Spongonema tomentosum (Hudson) Kützing, Cladosiphon irregularis (Sauvageau) Kylin. The first four of them are also new to the Aegean Sea. Data concerning geographical distribution, morphology and ecology of each species are also given.