Mahasen
Mahasen may refer to:

 Kartikeya, also known as Mahasen or Mahasena from maha (great) + sena (army), the Hindu god of war
 Mahasena of Anuradhapura, a king of Sri Lanka who ruled the country from 277 to 304 AD
 Cyclone Mahasen, a cyclonic storm in the Bay of Bengal in 2013, renamed Cyclone Viyaru due to apparent negative showing of the Anuradhapura king

See also 

 Mahasena (disambiguation)