Plastic bags' availability and frequent usage in urban areas have become significant environmental challenges due to their non-biodegradability impact, especially in densely populated cities like Dhaka. Bangladesh notified a nationwide ban on plastic bags in 2002. However, surprisingly, the increase in the use of plastic bags remains high, which hampers the ban's effectiveness. The study's primary purpose is to evaluate the effectiveness of banning plastic bags in Dhaka City, Bangladesh. This study conducted a mixed research method, including qualitative and quantitative analysis. For qualitative analysis, it utilized Semi-Structured Interviews to understand the overall effectiveness of this policy. For quantitative analysis, it conducted a survey questionnaire among 450 households. The study used the Statistical Package for Social Sciences (SPSS), version 25, to analyze data through descriptive statistics and a chi-square test. The residents of North City Corporation use 17 plastic bags on average in a week. Most of the people are aware of the banning decision through electronic media (18.2%), newspapers (13.6%), and community people (7.6%). The result also shows that plastic bags are commonly used in households, mainly for grocery shopping (33.3%) and food packaging (13.6%). The chi-square test reveals that there is a statistically significant association between educational qualification and people's stance on the prohibition (P- value <0.05) as well and the study also reveals that there is a significant influence of occupation on the frequency of plastic bag use (p-value < 0.05). This study also conducts a correlation between two continuous variables. However, alternatives like jute and cloth bags have become increasingly popular, frequently supplied by shops or bought independently by consumers. The challenges to the effectiveness of the ban on plastic bags include the affordability of alternative bags, the inconvenience of carrying them while shopping, and the failure of local businesses to comply with the ban. The study recommends taking measures to increase public awareness and reduce the cost of alternatives. Also, the government should emphasize imposing penalties to ensure implementing the plastic bag banning decision in Dhaka effectively.