The "Kingdom of Catan" (sometimes publicized as the Republic of Catan) was a fradulent and fictional micronation ostensibly based near Leeds in the United Kingdom.

Founded by a King James I, there is no evidence that anybody else was ever involved in Catan, despite his claims that the micronation had hundreds of citizens and even a functioning airline.

The entity first became well-known after ordering and receiving a shipment of flags, but thereafter refusing to pay for them. Another infamous incident occurred in 2017, when Catan falsely claimed that one of its "ministers" (in reality a fake social media profile created by James I with stock images) had been killed in the recent Manchester Arena terrorist attack.

One of the individuals claimed by James I to be the country's "Prime Minister" - when contacted by a person who went to school with him in an attempt to verify Catan's claims - stated that he had never heard of Catan and that James had stolen his name and image from social media.