The Aqua Line is a name common to a number of rail systems around the world. It can refer to:
Aqua Line (Mumbai Metro) Mumbai, Maharashtra, India Aqua Line (Noida Metro) Noida, Uttar Pradesh, India Aqua Line (Nagpur Metro) Nagpur, Maharashtra, India Aqua Line (Pune Metro) Pune, Maharashtra, India Aqua Line (Namma Metro) Bengaluru, Karnataka, India Canada Line Vancouver, British Columbia, Canada E Line (Los Angeles Metro) Los Angeles, California, United States of America Tokyo Bay Aqua-Line Tokyo Bay, Japan Mexico City Metro Line 4, Mexico