Sandoval, Martinez, Rauner, and Christie were each presented a proposed ban and given two choices: Sign it or veto it.
The practice of therapy aimed at changing an individual's sexual orientation or transgender status is considered ineffectual at best and harmful at worst.
Brian Sandoval has signed a bill prohibiting mental health professionals from subjecting children under 18 to conversion therapy.
Democratic State Senator David Parks, the legislator who sponsored SB 201, said in a statement that the law was "a major step forward in building a more equal and inclusive state".
Legislative attorneys have said that, based on court rulings in other states, the law will not limit licensed therapists from using conversion practices or exploring similar exercises when they act in a religious capacity.
The news comes a week after CT passed a similar ban, joining California, New York, New Jersey, Illinois, Oregon, Vermont, New Mexico and the District of Columbia have similar laws on the books.
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The Human Rights Campaign praised Sandoval and Nevada lawmakers for approving the ban. Connecticut, California, New Jersey, the District of Columbia, Oregon, Illinois, Vermont, New York, and New Mexico all have laws or regulations protecting youth from this abusive practice.
"The American Psychological Association has linked conversion therapy to depression, substance abuse and even suicide - risks that are particularly acute for youth", Reyes said.
Sandoval is the fourth Republican governor to sign into a law a ban on conversion therapy.
DE may be the next state to ban "ex-gay" therapy for youth. The 2016 Republican Party platform opposed conversion therapy bans for minors, declaring that "we support the right of parents to consent to medical treatment for their minor children".
'No child should be put through the unsafe and inhumane practice of conversion therapy, ' said HRC President Chad Griffin.