This paper explores the language policy of Singapore and characteristics of Singapore English with reference to the sound system, pronunciation, grammar, and vocabulary. The multi-ethnic nation Singapore has four official languages: Malay, Chinese, Tamil, and English. The former three represent the three major ethnic groups in Singapore, whereas English serves as lingua franca among the ethnic groups. Singapore English has four major varieties of acrolect, upper mesolect, lower mesolect, and basilect. The pronunciation of Singapore English is different from Received Pronunciation, and the grammar deviates from standard English. Singapore English also has various lexical items which are borrowed from background languages. Exploring language policy in Singapore and distinctive features of Singapore English, this paper attempts to contribute to a better understanding of the dynamic nature of English as an international language, and to examine its utilization in effective cross-cultural communication in a global society.