<jats:p> A new cyclic tetrapeptide, asperterrestide B (1), and 11 known compounds (2–12) were isolated from a marine-derived fungus Aspergillus terreus SCSGAF0162. The structure of 1 was elucidated by spectroscopic analysis, and the absolute configuration of 1 was determined by Mosher ester and Marfey's methods. Compounds 4, 6, and 8 had potent antifouling activity against larvae of the barnacle Balanus amphitrite, with EC<jats:sub>50</jats:sub> values of 17.1±1.2, 11.6±0.6, and 17.1±0.8 μg·mL-<jats:sup>1</jats:sup>, respectively.