Star Energy was a British onshore oil exploration company until acquired by IGas Energy in December 2011 It was formed in October 1999 essentially as a management buyout of operations in the Weald Basin, acquired from Soco International.

In May 2004 it became a public company, listed on the Alternative Investment Market (AIM).

In August 2005, it bought Pentex Oil, and increased its portfolio greatly in the East Midlands.

In November 2005 it opened its first gas storage facility at the depleted Humbly Grove oil field, near Lasham in Hampshire.

On 7 March 2008, it de-listed from the AIM stock market, becoming subsidiary of Petronas.