The former Genesis singer sent a letter on behalf of animal charity People for the Ethical Treatment of Animals (PETA), calling on Selfridges + Co chairman Galen Weston to ban the food, which is made of the engorged livers of ducks and geese.
The letter details the abuse the animals suffer before they are killed - which includes having pipes forced down their throats several times a day to force-feed them massive amounts of food.
Collins writes, "You probably know that every animal protection group in the world condemns foie gras as cruelty to the birds, with 15 countries actually banning its production. As you can imagine, the scientific consensus has to be very strong for a country to ban the production of something, but indeed, foie gras production is really that cruel. A description of foie gras production is not for the faint of heart.
"To force-feed the birds, pipes are rammed down their throats a few times per day. Many times, the pipes puncture the birds' throats, and the animals bleed to death. This cruel procedure causes the birds' livers to become diseased and swell up to 10 times their normal size. Birds that don't die became sick and lethargic, and indeed, death rates skyrocket during the force-feeding time.
"Won't you please dissociate Selfridges from this cruel industry that is opposed by about two-thirds of Britons? Selfridges' reputation is being dragged into the mud, which is tragic and not something you should allow to happen. Please, do the right thing - stop selling foie gras."
James Bond star Sir Roger Moore has also backed the PETA led campaign to stop Selfridges selling the food, which has already been banned in a number of major U.K. food stores.