The Duke of Cambridge has become the first member of the Royal Family to appear on the cover of a gay magazine.
He spoke to Attitude about the issue of homophobic bullying, saying: "No-one should be bullied for their sexuality or any other reason."
The duke invited the magazine to bring members of the LGBT community to Kensington Palace to discuss bullying and its mental health repercussions.
Kensington Palace said William had been "moved" by the stories he heard.
The nine people who attended the meeting last month spoke of low self-esteem, suicide attempts, drug addiction and depression.
William said that "no-one should have to put up with the kind of hate that these young people have endured in their lives".
The duke told the magazine: "The young gay, lesbian and transgender individuals I met through Attitude are truly brave to speak out and to give hope to people who are going through terrible bullying right now.
"Their sense of strength and optimism should give us all encouragement to stand up to bullying wherever we see it.
"What I would say to any young person reading this who's being bullied for their sexuality: don't put up with it - speak to a trusted adult, a friend, a teacher, Childline, Diana Award or some other service and get the help you need.
"You should be proud of the person you are and you have nothing to be ashamed of."