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Reddit is built around pseudonymous usernames, so there's no real-name or contact lookup. You find people through what they post and where, which is why the method depends on the clues you already have.
Quick answer: If you know the username, go straight to reddit.com/user/USERNAME. If you only know part of it, use the People tab in Reddit search. If you don't know the username at all, search Google with site:reddit.com plus a phrase, topic or place the person is likely to mention, then check which accounts show up repeatedly in the same subreddits. Reddit has no built-in way to look someone up by email address or phone number.
This is the most common case, and there is no single search for it. Work from the clues you have:
Expect to end up with candidates, not certainty. Reddit is designed to be pseudonymous.
Not through Reddit. Reddit doesn't offer search by email or phone number, and its password reset flow doesn't reveal which username belongs to an address. Third-party "people search" sites claim to link emails or phone numbers to social accounts; their results are hit-and-miss and depend on data the person may never have meant to share. If you need to reach someone you already know, the simplest route is to ask them for their username.
Run a reverse image search (Google Lens or similar). If the same image was posted publicly on Reddit, a reddit.com result will usually show up and lead you to the post and its author.
Reddit's search favors recent and popular content, deleted accounts show as [deleted], and some users hide their post history. Third-party archive tools that used to index Reddit lost most of their access after Reddit's 2023 API changes, so Google is now usually the better index for older posts.
Searching public profiles is fine; trying to unmask someone who chose to stay anonymous, or contacting them after they've made it clear they don't want contact, is not. Reddit's content policy prohibits harassment and posting someone's personal information. If you're doing this for work (recruiting, creator outreach, research), only use public information, record where each match came from, and give people an easy way to opt out.
If your team checks dozens of candidates a week, the steps above become repetitive: search, open profiles, compare clues, copy links into a sheet. Sai can run that loop in a browser for you: given a sheet of public clues, it searches Reddit and Google, opens candidate profiles, and writes back profile links, top communities and the evidence for each match, then flags anything it couldn't confirm. It works only with public pages and won't look up private contact details.
Related guides: view deleted Reddit posts · change your Reddit username · clean your Reddit history