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Peter Brady, portrayed by Christopher Knight in the TV show, Paul Sutera in theatrical films, and Blake Foster in the TV movie, is the middle Brady son. Peter often thinks badly of himself, such as believing he has no personality in the episode "The Personality Kid". The clumsiest of the bunch, he sometimes gets overexcited and acts before thinking. Nevertheless, he is a fun-loving boy whom girls adored later in the original series. He has a non-related twin named Arthur Owens (also played by Christopher Knight), who is shown in the episode "Two Petes in a Pod". Peter is also the only one in the family with brown eyes—all the others had blue or green eyes.

Peter later joined the military for career guidance, as seen in The Brady Girls Get Married. In later sequels, he is an administrative assistant (at one point, working under his fiancee, Valerie; they later end their engagement), and still later, a business partner with Bobby. Peter was the only Brady child to not have a spouse or significant other when The Bradys was cancelled.