English is regarded as a key to globalization or internationalization and future success for Taiwan and its people. One of the most extraordinary results of English-as-the-global-language of English teaching and learning in Taiwan is private English language schools are ubiquitous. Research into how private English language schools weld together English-as-the-global-language and English teaching and learning has yet received much attention. This study aims to investigate how Taiwan's private English language schools' television commercials market English-as-the-global-language and what the underlying ideologies of English-as-the-global-language are. Exploring the ideology of English-as-the-global-language, Critical Discourse Analysis was employed herein to analyze 106 private English language school television commercials produced from 2000 to 2020 in Taiwan. The results indicate that English as the key to internationalization and future success is an ideology. Moreover, the ideological concept of English-as-the-global-language is central to English teaching and learning ideologies in Taiwan, such as an early start in English learning, English-only as the ideal English teaching method, and native-speaker norms in English teaching and learning.