The woman was playing in the park at the Metro North Houses, a housing development in East Harlem, when she was hit by the large branch.
The park is near 102nd Street and 1st Avenue.
The woman was taken to NY Presbyterian Cornell in stable condition.
It happened at around 8 p.m. on Monday.
No one else was injured.
The area around the branch was cordoned off so the branch could be removed.
