'El Guaje' signed for the Catalan club from Valencia for €40 million last month, and the deal with his new employers is the first of its kind.
"It is the first time that a contract has been signed with an anti-racism clause included as introduced by the European Club Association," said Barcelona president Joan Laporta.
"From now on we will include it in all new contracts."
The anti-racism clause attached to Villa's contract stipulates that 'the player will not express or carry out, in any form, discriminatory ideas or acts, either during football games or in any club duties. The club will strongly condemn any discriminatory or racist act according to the agreement.'
Piara Powar, director of Kick It Out, described the move as "symbolic", and has indicated he wants to see more of the same, saying: "To have this clause within the contract of elite performers like David Villa sends out a categorical message.
"Our congratulations for their work on the initiative go to the ECA, UNESCO and Juan Laporta himself, who has been a driving force."
Kick It Out, which strives to bring equality and inclusion to football, was established as a body in 1997 and its campaign Let's Kick Racism Out of Football is supported and funded by the likes of the Professional Footballers Association (PFA) and the Premier League.
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