A hair ornament includes a body having an engagement section to be in contact with hair of a user. The engagement section includes a row of plates arranged along a length direction of the body. Two of the row of plates adjacent to each other are connected by a connecting member having first and second ends. The first end of each connecting member is pivotably connected to one of two adjacent plates. The second end of each connecting member is pivotably connected to the other of the two adjacent plates. A spacing between two adjacent plates is adjustable by pivoting the two adjacent plates to adjust an overall length of the body in the length direction of the body.