Robots and Empire
- A robot may not injure a human being, or, through inaction, allow a human being to come to harm.
- A robot must obey the orders given it by human beings except where such orders would conflict with the First Law.
- A robot must protect its own existence as long as such protection does not conflict with the First or Second Laws.
"Runaround" in Astounding Science Fiction (March 1942); later published in I, Robot (1950). This statement is known as "The Third Law of Robotics"
Later included among these laws was "The Zeroth Law of Robotics"
- A robot may not injure humanity, or, through inaction, allow humanity to come to harm.
Robots and Empire (1985) This statement is known as "The Zeroth Law of Robotics"; a variant of it first occurred in The Evitable Conflict (1950)