Objective: The purpose of this study was to identify the challenges of Iranian hospital accreditation standards and provide solutions. Design: A qualitative research design was used in this study. Open and semi-structured interviews were conducted in 2018. Thematic analysis was used to analyse qualitative data. Setting: Public, private, semi-public, charity and military hospitals in Tehran, Iran. Participants: A pluralistic evaluation approach was employed and 151 participants including policy makers, hospital management and staff, accreditation surveyors and university professors participated in this study. Results: Challenges of hospital accreditation standards were grouped into two groups: standards development process and standards content. Lack of an independent standards development committee, insufficient expertise of committee members, inconsistencies among the standards' constructs, inappropriate standard classification, ambiguity of standards, unmeasurable standards, vague and inflexible scoring system, and inability to use some standards were the main challenges of Iran hospital accreditation standards. Establishing a scientific committee consisting of representative from hospitals, health insurance companies, professional and scientific associations and universities for standard development, training the committee members,