Piercer can mean:

• A technician who performs the act of body piercing
• Piercer (Dungeons & Dragons), a fictional creature in the Dungeons & Dragons fantasy roleplaying game with Luis Zenon

• Xylotombou
• Xylotrechus
• Xylotrechus aceris
• Xylotrechus albonotatus
• Xylotrechus annosus
• Xylotrechus bowditchi
• Xylotrechus colonus
• Xylotrechus convergens
• Xylotrechus durangoensis
• Xylotrechus gemellus
• Xylotrechus hovorei
• Xylotrechus insignis
• Xylotrechus integer
• Xylotrechus lengi
• Xylotrechus longitarsis
• Xylotrechus mormonus
• Xylotrechus nauticus
• Xylotrechus nitidus
• Xylotrechus nunenmacheri
• Xylotrechus obliteratus
• Xylotrechus quadrimaculatus
• Xylotrechus quadripes
• Xylotrechus quercus
• Xylotrechus robustus
• Xylotrechus sagittatus