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Nancy Oleson is the adopted daughter of Nels and Harriet Oleson. Her personality and behavior reflects much of Nellie's when she was young. After being brought back from the orphanage, Nancy was quickly spoiled by Harriet and soon after caused trouble in Walnut Grove, like fooling Willie into locking fellow classmate and rival Belinda Stevens in a ice shed so that Nancy could play the lead part in an upcoming musical at the school.

Nancy also convinces the class that she was abandoned by her mother. Laura finds this is untrue. It turns out that Nancy's mother died while giving birth, and Nancy was forced to move into an orphanage because of her increasingly uncontrollable behavior. Laura, with some help from Belinda Stevens, convinced Nancy to be the queen of the dunk tank at Walnut Grove's upcoming festival. This proved to be the first of many schemes for Nancy.

Nancy causes much trouble through the series. She uses an obese boy (Elmer) to do her homework, she bullies Cassandra sometimes, and when she is about to get in trouble she says, "You hate me! Why does everyone hate me!" This makes Harriet quickly forgive her while Nels just rolls his eyes. Nancy once met Nellie in 'The Return of Nellie' and they didn't really get along. Nellie had a huge birthday party and Nancy didn't get enough attention so she ran away. But Nellie found her in the woods after Nancy was attacked by a wolf. Nellie brought her home and it seemed as though Nancy learned a lesson. But, of course, she didn't.

Behind the scenesEdit

Nancy Oleson was portrayed by Allison Balson throughout the series starting in season eight.