Z-line

The Z-line or Line Z may refer to:

• J/Z (New York City Subway service)
• Line Z (Tren Interoceánico), a Mexican railroad corridor
• Z-line (IRC), a type of Internet Relay Chat access ban
• Gastroesophageal junction, that joins the oesophagus to the stomach
• Z-line, a border that separates and links sarcomeres within a skeletal muscle