Government Service Delivery Improvement Act This act requires that certain government officials be responsible for improving government service delivery (i.e., actions by executive branch agencies related to providing benefits or services to individuals, businesses, and organizations). The act requires the Office of Management and Budget (OMB) to designate or appoint a senior official within OMB as the Federal Government Service Delivery Lead. This individual is responsible for coordinating government-wide efforts to improve government service delivery by agencies. The act also requires the head of each agency to be responsible for the agency's government service delivery, including improving and enhancing government services to better achieve the mission of the agency and build and maintain trust, transparency, and accountability. Each agency head shall also designate or appoint a senior official of the agency whose duties shall include coordinating and executing efforts to improve and enhance the agency's government service delivery and government service delivery channels (i.e., the mediums of interaction or transaction with the federal government, such as mail, phone, or website).