Sh 2-308, also designated as Sharpless 308, RCW 11, or LBN 1052,[1] and commonly known as the Dolphin-Head Nebula, is an H II region located near the center of the constellation Canis Major, composed of ionised hydrogen.

The nebula is bubble-like and surrounds a Wolf–Rayet star named EZ Canis Majoris.

[7] EZ Canis Majoris is expected eventually to explode in a supernova, therefore subsuming the nebula.

[10] The most favorable period for observing the nebula in the night sky is between the months of December and April.

It appears as a faint cloud in photographs taken with high-power amateur instruments, with the help of special filters.