A Mind to Kill is a Welsh television police detective series, that developed from a feature-length pilot episode first broadcast in 1991. The series stars Philip Madoc as protagonist DCI Noel Bain. Four series were broadcast between 1994 and 2002, though the Christmas special is sometimes counted as a separate series, bringing the total to five. The show first aired as Yr Heliwr on S4C, before being broadcast on Channel 5 in the UK.

The series was filmed in both English and in Welsh, with each scene being shot first in one language and then in the other. The series has since been dubbed into more than a dozen languages and shown all over the world. The series is set in South Wales, and features a variety of post-industrial, rural, urban and seaside landscapes. The pilot episode was filmed in the Aberystwyth area. All twenty-two episodes are available on DVD.