Omnishambles is a neulogism that was first coined in 2009 by the writers of BBC political satire The Thick of It and has since entered public use. It is an amalgamation of the Latin prefix omni-, meaning all, and shambles, which means total chaos. The word refers to a situation which is shambolic from every possible angle.

Its first recorded use was in the UK House of Commons by Labour party leader Ed Miliband in April 2012. The word then took off as a term of criticism by opposition parties attacking the government, whilst being mutated on social media into humourous variants such as 'Romneyshambles'. The word was named the Oxford English Dictionary's 2012 Word of the Year.