The discovery of high temperature superconductors has revived the interest in rf SQUIDs, which, in the case of conventional superconductors had been surpassed in performance by the dc SQUID. Several advantages are offered by the rf SQUID, like the requirement for only a single weak link and a low 1/f noise. With high bias frequencies (> 100 MHz) it is possible to obtain flux noise values comparable to dc SQUIDs. At present, HTS rf SQUIDs offer a field sensitivity of less than 100 fT/(root)Hz ( 1 Hz). This is already sufficient for a number of serious applications. This paper reviews recent developments towards practical rf SQUIDs made of high-T(subscript $c/ superconductors.