- For the Arrow episode, see Doppelganger.
- For cases of individuals fulfilling the same name or role as others through the multiverse but without looking the same, see Multiverse counterpart.
- "And these other Earths, 3, 4, 5, to infinity, all of them, are nearly identical to ours. And they all exist at the same time, giving us endless alternatives to what we have here. For example, the Joe West on Earth-2, your doppelgänger, he might not be a detective. He could be a Nobel Prize-winning physicist. And you, the Barry Allen here is the Flash, but over there, he could be an electrician."
- —Martin Stein[src]
A doppelgänger is an individual that looks the same as another. In the multiversal sense, a doppelgänger typically refers to an alternate universe version of an individual. In some cases, these doppelgängers may also share similar-looking alter egos, often if they both act as vigilantes on their respective Earths, such as Earth-38's James Olsen and his Earth-X counterpart having similar-looking suits that they wear when operating in the field.
Known doppelgängers
Unseen doppelgängers
Though at least one of the pair have never been seen, the following individuals and their respective equivalents are presumed to be doppelgängers:
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