Boris Skossyreff (born 1898) was a Russian adventurer.

On July 6 1933, Skossyreff was proclaimed King Boris I with the support of several disaffected Andorrans, some in high positions in the government. On July 14th "King Boris" was removed by a group of the Guarda Civil sent by the Bishop of Urgell. Skossyreff was taken to Barcelona and then Madrid before being expelled to Portugal. The resultant turmoil culminated in the nation's judicial authority, the Tribunal de Corts, firing the members of the Council Of The Land who had supported Skossyreff's claim.

In order to prevent the total dissolution of law and order, the French government sent squads of gendarmes to keep domestic order. They occupied the country from August 8 to October 9th. In this period, the Andorrans held elections, re-established the Council Of The Land, with all men over the age of twenty-four being allowed to vote, and all men over thirty allowed to hold office.