Eureka (stylized as EUReKA) is an American science fiction television series that premiered on Sci-Fi Channel (renamed Syfy in 2009) on July 18, 2006. The fifth and final season ended on July 16, 2012. The show is set in the fictional town of Eureka, Southern Oregon (although in the pilot episode Eureka was located in Washington – and the origin of a diamond in the episode "Best In Faux" was shown as Eureka, California). Most residents of Eureka are scientific geniuses who work for Global Dynamics – an advanced research facility responsible for the development of nearly all major technological breakthroughs since its inception. Each episode featured a mysterious accidental or intentional misuse of technology, which the town sheriff, Jack Carter, dealt with, with the help of the town scientists. Each season also featured a larger story arc that concerned a particular major event or item.

The series was created by Andrew Cosby and Jaime Paglia and produced by Universal Media Studios. While initially lacking in critical acclaim, Eureka was a ratings success for the network, averaging 3.2 million viewers during the second half of season three. In 2007, Eureka was nominated for the Emmy Award for Outstanding Visual Effects for a Series, and won the Leo Award for Best Visual Effects in a Dramatic Series. In the United Kingdom and Ireland, the show airs on Syfy and is known as A Town Called Eureka, although it is also shown under its original title on the BT Vision platform.