This bill, known as the "No Community Development Block Grants for Sanctuary Cities Act," aims to prevent jurisdictions identified as sanctuary jurisdictions from receiving federal Community Development Block Grants (CDBG). It amends Title I of the Housing and Community Development Act of 1974 to establish this new eligibility requirement. A "sanctuary jurisdiction" is defined as any state or political subdivision that has a statute, ordinance, policy, or practice restricting government entities or officials from either sharing information regarding an individual's citizenship or immigration status, or complying with lawful Department of Homeland Security detainer requests. However, an exception is made for policies that protect victims or witnesses of criminal offenses from having their information shared or detainers complied with. Specifically, the bill adds a new condition to the eligibility criteria for CDBG funding, requiring that a grantee is not currently a sanctuary jurisdiction and commits to not becoming one during the grant period. This ensures that only non-sanctuary jurisdictions can access these federal housing and community development funds.