Life Regeneration

Life Regeneration is the rate at which you regain your Life. When you are out of Health Potions and there aren't any Health Globes to be found, Life Regeneration becomes very important. The faster you can regain Life, the less idle time you will have and the quicker you will be able to jump back into battle.

Life Regeneration rate can be increased by equipping Life Regeneration gear or by using Skills that increase Life Regeneration.

Also See:
Healing
Life Steal

The Following Is A List Of Each Class' Skills That Will Increase Life Regeneration:
 

Barbarian Skills That Increase Life Regeneration

War Cry (Invigorate)
Inspiring Presence
Juggernaut

Demon Hunter Skills That Increase Life Regeneration

Sentry (Aid Station)
Brooding (Passive Skill) 

Monk Skills That Increase Life Regeneration

Inner Sanctuary (Safe Haven)
Mantra of Healing 

Witch Doctor Skills That Increase Life Regeneration

Spirit Walk (Healing Journey)
Big Bad Voodoo (Ghost Trance)
Blood Ritual (Passive Skill)

Wizard Skills That Increase Life Regeneration

Galvanizing Ward (Passive Skill)

Follower Skills That Increase Life Regeneration

Templar (Loyalty)
Templar (Guardian)