This study aims to investigate which form of Bengali, Chittagonian or Standard, is most commonly used by native Chittagong speakers in their everyday lives. In other words, it seeks to determine if there is a language shift and the maintenance of Chittagonian amid Standard Bengali's dominance. The native speakers of Chittagonian from 19 distinct locations in the Chittagong district participated in the study. The study's time frame was from May 2022 to August 2022, and 117 respondents were interviewed using a formulated questionnaire. Descriptive statistics is used for quantitative analysis. The study's findings demonstrate that language usage preferences vary depending on the context. According to the results, most respondents are comfortable using Chittagonian with family and in their neighborhoods. In contrast, Standard Bengali is widely used in education and public settings because it effectively conveys information. The study concluded that as most of Chittagong's local people continue to speak Chittagonian, it is not at imminent risk of being completely displaced. Although the Chittagonian language is shifting in education and public places, the transition is gradual, and the language is still safe. It indicates that Chittagonian is preserved by locals and will continue to be used for generations to come.