Angela Martin is the head of the accounting department at the fictitious paper distributor Dunder Mifflin, Scranton Branch. Judgmental and uptight, Angela frowns upon all frivolous activity in the office and openly shows her disapproval of office receptionist Pam Beesly’s flirtation with coworker Jim Halpert. Despite all that, Angela used to be in a secret relationship with Dwight Schrute that the pair go out of their way to mask. In addition to heading the accounting department, Angela is also the office safety officer. She is a constant source of complaints to Human Resources, although she "redacts" those lodged against Dwight Schrute at the onset of their secret romance. Angela lives with several cats, adores posters of infants posed as adults, is a vegetarian and a singer. When she makes a mistake, Angela's first response is usually to shift the blame to someone else, along with an insult. Despite being homophobic, she is a secret fan of Will and Grace, but only because she enjoys the acting of Harry Connick, Jr. She is a former child beauty pageant contestant, and says that she enjoys being judged. Angela bottles up her emotions to the point that, on occasion, she has private, emotional outbursts over relatively trivial matters. She also seems to be somewhat of a Fundamentalist Christian. She states that the two books she would bring with her if stranded on a deserted island are the Bible and A Purpose Driven Life. Further, she would bring The Da Vinci Code, so she could burn it. In a deleted scene from Season 3, Angela glowingly compares Dwight to Sean Hannity.

Angela has a sister to whom she has not spoken in sixteen years over a disagreement she does not even remember.

Angela's middle name has not been revealed outright, but there are indications that it may be Noelle. ("Traveling Salesmen")

Angela drives a Ford Focus.

Angela claims to weigh ninety pounds and wears a children's size ten ("Women's Appreciation"). In addition, because she finds the clothes at Gap Kids to sometimes be too "flashy," she occasionally shops at the American Girl store, buying items meant for "large colonial dolls".

Angela rules the Party Planning Committee with an iron fist. Usually when a committee member suggests an idea, Angela immediately shoots it down with a mean comment or sharp rebuke. The Party Planning committee normally consists of Angela, Pam, Phyllis, and Meredith, although Meredith was naturally not present when the committee planned her surprise birthday party. Karen becomes a regular member of the Party Planning Committee when she is transferred to Scranton. Ryan joined the committee to help plan the Christmas Party, and Oscar joined it to help plan his "Welcome Back" party ("The Return").