Gamo, an important member of the Ometo linguistic cluster, is spoken to the west of the Rift Valley in southern Ethiopia. Based on the native speaker utterances and intuitions of one of the authors this pioneer work presents a basic grammar together with a first dictionary. Lexical entries are glossed in both English and Amharic, but the grammatical description is in English only. The usage of most entries is illustrated in example sentences, which in addition to English and Amharic translations have detailed grammatical analyses.