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Crypto-Judaism is the secret adherence to Judaism while publicly professing to be of another faith; practitioners are referred to as "crypto-Jews".

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Archibald Stansfeld Belaney, commonly known as Grey Owl, was a British-born conservationist, fur trapper, and writer who disguised himself as a Native American man. While he achieved fame as a conservationist during his life, after his death the revelation that he was not Indigenous, along with other autobiographical fabrications, negatively affected his reputation.

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Kakure Kirishitan is a modern term for a member of the Catholic Church in Japan that went underground at the start of the Edo period in the early 17th century.

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Marranos were Spanish and Portuguese Jews living in the Iberian Peninsula who converted or were forced to convert to Christianity during the Middle Ages, yet continued to practice Judaism in secret.

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Korla Pandit, born John Roland Redd, was an American musician, composer, pianist, and organist. After moving to California in the late 1940s and getting involved in show business, Redd became known as "Korla Pandit", a French-Indian musician from New Delhi, India. However, Redd was actually a light-skinned African-American man from Missouri who passed as Indian. A pathbreaking musical performer in the early days of television, Redd is known for Korla Pandit's Adventures In Music; the show was the first all-music program on television. He also performed live and on radio and made various film appearances, becoming known as the "Godfather of Exotica". Redd maintained the Korla Pandit persona—both in public and in private—until the end of his life.

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Transracial people are individuals who assert a racial identity for themselves which differs from their birth race.

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To go "undercover" is to avoid detection by the entity one is observing, and especially to disguise one's own identity or use an assumed identity for the purposes of gaining the trust of an individual or organization to learn or confirm confidential information or to gain the trust of targeted individuals in order to gather information or evidence. Traditionally, it is a technique employed by law enforcement agencies or private investigators, and a person who works in such a role is commonly referred to as an undercover agent.