The nursing schools at the University of Puerto Rico (UPR) are not accredited by US-based accrediting agencies in the same way that nursing schools in the 50 states are. Puerto Rico has its own accreditation system. While their programs may meet certain standards, they are not directly accredited by the Commission on Collegiate Nursing Education (CCNE) or the Accreditation Commission for Education in Nursing (ACEN), which are the main US accreditors.
Therefore, the answer is no, they are not accredited by *US* accrediting bodies. However, they *are* accredited by the Puerto Rico Board of Nursing, which is the relevant authority for licensing and practice in Puerto Rico. Whether or not that accreditation will be sufficient for licensure or further education in the US will vary by state.