This study aims to reveal the impact of the COVID-19 pandemic on the necessity of using English as an international language. For this purpose, this study conducted a web survey of Japanese workers, and statistically examined the extent to which the use of English increased or decreased after the outbreak. The findings are as follows. First, although some types of use decreased or increased, the majority did not show substantial changes. Second, the changes in English use were largely influenced by worker factors, such as types of occupation and employment (e.g. it declined typically among sales workers but not among the self-employed and freelancers), the degree of remote working (e.g. not being allowed to work remotely reduced it), and industry (e.g. it declined among workers in accommodation and real estate sectors but increased among public servants). These findings suggest the following implications: (1) non-decline in English use would suggest its resilience as an international language, the necessity of which could endure even in such a global upheaval; and (2) the frequency of using English (and other modes of international communication) is relatively independent of reduced human mobility, but it is largely affected by the economic climate.