Which country is the largest donor for Bangladesh at present?

As of my limited knowledge up until April 2023, the largest donor to Bangladesh is the United States. The US has been significantly assisting the country's development projects and social welfare programs for several decades. However, it's possible that there have been changes in donor funding arrangements since then. To obtain the most current and accurate information, I recommend consulting the latest official sources such as the World Bank, the Bangladesh government, or other relevant organizations.