English has been serving as a worldwide language for a very long time. For that matter, many countries have been using English as medium of instruction at different levels such as secondary and tertiary levels. Ethiopia is one of the countries in which English is included in the curriculum as a subject in all grade levels, and it also serves as the medium of instruction starting from grade nine to tertiary levels. However, learners of English language often express a feeling of stress, nervousness or anxiety while practicing speaking in English, as English is given as a foreign language. So, this book describes the levels of English Language Anxiety (ELA)of high and low achievers, identifies the relationships among language achievement, anxieties related to foreign language anxiety and Foreign Language Classroom Anxiety Scale (FLCAS) Scores; and tries to identify the most serious potential source of English language classroom anxiety in Ethiopian EFL context.