The series, which is written by its two stars and produced by Avalon, debuted on Channel 4 last week and attracted a consolidated audience of 1.2 million.
Its supporting cast includes Carrie Fisher, Ashley Jensen and Mark Bonnar.
Jay Hunt, Chief Creative Officer at Channel 4, said: “Catastrophe is a real comedy gem. Sharon and Rob have done a magnificent job and we’re already looking forward to series 2”.
Jon Thoday, Joint MD of Avalon, added: “It’s a real pleasure to be working with such a talented team on such a great show and I’m delighted that we’ll be making more episodes with Channel 4.”