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| Karen Nelson | |
| Continuity: | Halloween film series |
| Notability: | Supporting character |
| Type: | Survivor |
| Gender: | Female |
| Race: | Human |
| Location: | Haddonfield, Illinois |
| Relatives: | Laurie Strode Ray Nelson Allyson Nelson |
| Status: | Alive |
| First: | Halloween (2018) |
| Actor: | Judy Greer |
Karen Nelson is a fictional mass murderer survivor and a supporting character featured in the Halloween film series. Played by actress Judy Greer, she appeared in the 2018 film Halloween.