  Star clusters provide an excellent opportunity to study the role of
environment on determining the frequencies of short period planets. They
provide a large sample of stars which can be imaged simultaneously, with a
common distance, age and pre-determined physical parameters. This allows the
search to be tailor-made for each specific cluster. Several groups are
attempting to detect transiting planets in open clusters. Three previous
surveys have also targeted the two brightest globular clusters. No cluster
survey has yet detected a planet. This contribution presents a brief overview
of the field, highlighting the pros and cons of performing such a search, and
presents the expected and current results, with implications for planetary
frequencies in regions of high stellar density and low metallicity.
