St Paul International and St Paul at Lloyd's will be rebranded by the end of this year.
The decision to embark on a rebranding programme came from the $16bn merger of parent St Paul Companies and Travelers Property Casualty last November. The merger has created the second largest insurer in the US.
A spokesman for St Paul International said: "The UK arm has decided to change its image to reflect the successful merger with Travelers. No specific date has been set but we hope to have the rebranding done by the fourth quarter."
He added that the distinctive blue of the UK arm of
St Paul International would be replaced with a red and black motif.