Kinder Surprise (Italian: Kinder Sorpresa or Ovetto Kinder), also known as Kinder Egg or Kinder Surprise Egg, is a milk chocolate consisting of a chocolate egg surrounding a yellow plastic capsule with a small toy inside. Manufactured by the Italian company Ferrero since 1974, it was co-created by Michele Ferrero and William Salice, and is one of several candies sold under the Kinder brand.

Kinder Surprise was originally created with children in mind, replicating an Italian Easter family tradition in which adults give children large chocolate eggs with toys inside, but Kinder Surprise toys have become collectible for adults as well. As of 2016, 30 billion Kinder Surprise eggs have been sold worldwide since its launch in 1974.

Kinder Surprise is a milk chocolate egg lined with a layer of white chocolate. Inside each egg is a plastic capsule, which would be twisted open along its circumference, and that contains a small surprise toy, which sometimes requires assembly. The capsule case is colored yellow and sometimes orange, to resemble an egg's yolk. The chocolates have foil packaging with warning labels advising parents to avoid giving the eggs to children under three years old and encouraging supervision during consumption.

Kinder Surprise was originally created with children in mind, replicating an Italian Easter family tradition in which adults give children a large chocolate egg with a toy inside, but Kinder Surprise toys have become collectible for adults as well. Collectors often try to acquire all toys within a themed set. Some even share their egg openings on social media, or create their own toys and re-wrap them in Kinder Surprise packaging. More than 100 new toys are distributed each year. Around 12,000 different toys had been included within Kinder Surprise as of 2016.

According to CNN Business, Kinder Surprise is most popular in Germany, Russia, and the United Kingdom. Michele Ferrero and William Salice have been credited as co-creators of the candy.

In 1968, Michele Ferrero raised the idea with his employees of a product that could be given to children so they could have a little "surprise" every day, based on the Italian tradition of large chocolate eggs given to children by their parents at Easter. Ferrero said that at first his attempt to follow through with this idea was unsuccessful after employees questioned the order he placed for a machine to make the chocolate eggs. They thought it would not make any money, since eggs are only for Easter. Ferrero also said that he wanted the product to have a higher milk content and make that a key part of its promotion; he believed mothers would respond well to the idea of giving their children more milk. Ferrero commissioned William Salice to realize the concept.

The Italian company Ferrero began manufacturing Kinder Surprises in 1974. Since then around 30 billion eggs have been sold worldwide.

Salice, who has been credited as the inventor of Kinder Surprise but insisted he was just "material executor", died in Italy on 29 December 2016, at the age of 83.