GOD'S WORD® Translation
Those who believe in him won't be condemned. But those who don't believe are already condemned because they don't believe in God's only Son.

American Standard Version
He that believeth on him is not judged: he that believeth not hath been judged already, because he hath not believed on the name of the only begotten Son of God.

Berean Study Bible
Whoever believes in Him is not condemned, but whoever does not believe has already been condemned, because he has not believed in the name of God’s one and only Son.

Douay-Rheims Bible
He that believeth in him is not judged. But he that doth not believe, is already judged: because he believeth not in the name of the only begotten Son of God.

English Revised Version
He that believeth on him is not judged: he that believeth not hath been judged already, because he hath not believed on the name of the only begotten Son of God.

King James Bible
He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God.

World English Bible
He who believes in him is not judged. He who doesn't believe has been judged already, because he has not believed in the name of the one and only Son of God.

Young's Literal Translation
he who is believing in him is not judged, but he who is not believing hath been judged already, because he hath not believed in the name of the only begotten Son of God.

John 3:18 Additional Translations ...