The park’s French-language website offers special discounts for French nationals that are not available in the UK, and travellers are blocked from the site if they try to buy the deals with a credit card not registered in the country.
French families can buy day passes for two adults and two children to visit Disneyland Park and Walt Disney Studios for 142 euros (£119).
British families would have to pay £192 – 62 per cent more – as they are unable to access the offer which lets children under 12 get free entry.
In another offer, French customers can buy day tickets for 44 euros (£37) each for adults and children, but Britons must pay £50 for adults and £35 for children.
Customer David Pascoe, from Newmarket, Suffolk, tried to buy tickets for the theme park this summer, but his credit card was blocked by the site.
He said: “It seems very unfair to charge families vastly different prices for exactly the same thing, just because they are coming from a different country.
“I tried to get the 71 euros adult tickets that come with free entry for a child, but when I put in my credit card details, it got rejected because it was not French.”
A Disneyland Paris spokesman said: “We strive to offer all our visitors the best value and flexibility when booking a trip to Disneyland Paris, with a wide range of promotions available to suit visitors’ different needs.
“A variety of promotions are offered at different times of the year to each market to reflect the local needs.
“In the case of the UK market the most popular promotions are those combining accommodation and/or travel plus park tickets.
“A recent promotion exclusive to the UK market offered up to 50 per cent off hotel and park tickets, plus free hotel and park tickets for children under 12.”
The park is currently planning to celebrate its 20th anniversary in April with a new night show in front of the Sleeping Beauty Castle, with lasers, fountains and pyrotechnics, plus a revamped evening parade with new choreography, costumes and music.