The Faceless / Real Life

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• In many religious traditions, it is considered blasphemous to depict God visually. Whenever God is featured in a work of fiction, either His face is obscured or it's made explicit that His chosen appearance is simply A Form You Are Comfortable With (the latter fulfills this trope conceptually if not directly). In Sunni Islam, it's also prohibited to depict Muhammad, (Shias only apply this to his face, as well as those of the Imams) so in Islamic art he's frequently drawn as a figure with a face of pure light, wearing a veil or something else of the sort. Some Muslim art from before 1500 or so does show his face, though. That's the reason for Chick Tracts and VeggieTales having examples of this.
• In Christianity, it's not so much that it's blasphemous per se (otherwise, the Pope would have put the kibosh on Michaelangelo's renovation of the Sistine Chapel, especially the famed "Birth of Man" that forms the centerpiece of the ceiling) to make representations of God, as much as it's well-nigh impossible to do it right — many artists throw up their hands in trying to put human limitations on a limitless being by trying to depict Him. That's why you either get the kindly man with a beard or... no depiction at all. Some branches of Christianity, especially more conservative Reformed denominations, do consider images of God and Christ to be blasphemous, as a violation of the Second Commandment ("You shall not make an image of anything in heaven, earth, or under the earth, and bow down and serve it"), since the whole point of reverential images of Jesus is to draw Christians to worship Him.
• Amish dolls are a style of rag doll that have no faces (and frequently, no hair). The story behind this blank face varies; some stories say that a father replaced the head of his child's originally-faced doll with a sock and said that only God can make people, while others say the lack of face means that everyone is equal in God's eyes or that it's following the commandment against graven images.
• A National Geographic photo-essay about the White House staff had the president only shown from behind, with his face covered, or just out of frame. Not for secrecy, but because the focus of the article was his staff rather than him. This is a pretty common practice whenever the president is featured in a TV show or movie, when they don't want to use a fictional president, but don't want to date themselves by portraying the one currently in office. See also Invisible President.
• Daft Punk have never revealed their faces, to the point where some people theorize that they might be actual robots.
• The Unknown Comic, who made a running gag out of performing with a paper bag over his head.
• While American Professional Wrestling has portrayed masks as being Serious Business, Mexican lucha libre takes it very seriously. Once a luchador has donned a mask, he will never reveal his face in public again until he's beaten in a match where he put up his mask against that of another masked wrestler or an unmasked wrestler's hair as a bet to end a feud. If the Mask loses he takes off the mask and can never use it ever again, and if the Hair loses, he has to shave his head.
• Ever heard of The Man in the Iron Mask? In real life the mask was made of silk, and the man was most likely a spy whose identity could have caused an international incident — not Louis XVI's identical twin as per the book and the movie.
• During Saddam Hussein's trial, the presiding judge was always shown from behind.
• Undercover police always wear masks on television to avoid being identified by criminals during operations, as do soldiers and police in the ongoing Mexican Drug War to avoid being murdered by narcos.
• This is standard depiction of Master P., also known as Anonymus, an unknown Hungarian writer from the 13th century.
• In Britain (and maybe in other countries) during the era of steam railways, the ticket booths at railway stations commonly shielded the booking clerk from view of the public, for some reason - perhaps for privacy. This meant that the most you ever saw of the person who sold you your ticket was a disembodied hand in the hatch, and maybe they'd speak if you were really lucky.
• In Brazil, the Silvio Santos Show had an announcer named Lombardi that was never seen by anyone. In fact, before the internet, no one even knew what he looked like (or rather, he even appeared in some photos, but before the internet, it was very hard to find them). Even after his death, 90% of the audience of the program (that took almost all of Sunday's afternoons and evenings slots in that network) still doesn't know his face.
• Also in Brazil, back in 2002, it was found out that a babysitter was abusing the children she was supposed to take care of. Enraged, the people of Aparecida de Goiânia beat her up. One such person, recorded on video, divekicked her in such a way that his legs made a perfect rhombus shape. He became a Memetic Badass known as Lindomar, the Brazilian Sub-Zero, but because he's seen from the back, the video quality was bad and his face appears for only a splitsecond, no one knows what he really looks like.
• Italian radio newscaster Augusto Abbondanza is always shown in the dark in official pictures, to the point that someone suspects he's a joke persona, given his strange voice and weird, stilted way of delivering news to listeners. Even his name sounds fake. He however denies these accusations.
• The dance crew Jabbawockeez wear white masks and white gloves in an attempt to invoke this, to avoid any one dancer from standing out over the crew as a whole during a performance.
• It used to be standard practice for newspaper restaurant critics to have obscured or in-disguise headshots in the paper out of fear they'd be recognized (and given preferential treatment) when visiting restaurants.
• You, the reader of this text, are of the "first person perspective" variant. Unless you have a mirror nearby or have a photo taken of you, you are never going to see your face even though you can see the most of your body.
• There may be someone you hear about or communicate with that you never actually see (like a relative, or a person who answers calls for customer support). This is the case for pretty much anyone you haven't seen a picture of or met with in person yet. This especially holds true for Internet users, like uh, us.
• The famous "Tank Man" from the iconic photo of the 1989 Tinananmen Square Masscare. No identified picture of his face has ever been seen.
• Reclusive Artist Paru Itagaki, creator of Beastars, always wears a chicken mask when she appears in public.
• The members of Man With a Mission, an Anonymous Band, always wear wolf masks, which they insist are not masks.
• While plenty of photos and videos exist of him before then, Toby Fox elected to stop showing his face for any public appearances/events after the release and surprise popularity of Undertale, first taking a photo of himself in a cardboard Ice-E mask as a default image for online sources before settling on various depictions of the Annoying Dog.
• Brazilian You Tuber Otário Anonymous is an activist who wears a bag of bread on his head to hide his identity and have more freedom to make videos denouncing false advertising from companies and politicians.

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