"You Will Know" is a song written and recorded by American R&B singer-songwriter Stevie Wonder, taken from his 1987 Characters album.

This is Stevie Wonder's 20th and final number-one R&B hit single.

[2] Wonder performed the song along with R&B quartet Jodeci and Mary J. Blige on an episode of The Arsenio Hall Show in late 1992.

[5] Karen Swayne from Number One wrote, "This isn't one of the best tracks, but there's a warmth and humanity to it that means all but the hardest hearted will forgive him (for) crooning trite platitudes like 'problems have solutions/trust and I will show.'

"[6] Jon Pareles of the New York Times described You Will Know as "a typically lush Wonder ballad with verses about a drug user and a struggling single parent; the chorus, presumably a voice from heaven, says, Trust and I will show.