A half-turn may refer to:

• A point reflection: a rotation of 180 degrees around a point
• A U-turn: a driving maneuver used to reverse direction

• Lianne
• Lianne Mars
• Lianne Sanderson
• Lianne Shirley
• Lian Nu
• Lianoningosaurus paradoxus
• Lianping Prison
• Li Anqi
• Lian Ross
• Lianshan Zhuang and Yao Autonomous County
• Lianshui County
• Lian sifuentes
• Lian (station)
• Lian Wharton
• Lianwu
• Lian Xing
• Lian Yang
• Lian Yang (weightlifter)
• Lianyuan
• Lianyungang Baitabu Airport
• Li Ao (722-841)
• Li Ao (772-841)
• Liaobei
• Liaoceratops yanzigouensis
• Liaocheng