The Duke and Duchess of Cambridge will mark World Mental Health Day by meeting young people who have battled the issue and are now helping others.
They will visit Harrow College in north-west London and chat to young people who volunteer with the charity Mind, or the anti-stigma campaign Time to Change, after having dealt with their own mental health problems.
The visit coincides with World Mental Health Day - a day when awareness is raised around the world about the issue.
William and Kate have carried out engagements in recent weeks which have shone a light on the causes and consequences of mental health problems.
The Duke took part in an anti-bullying workshop run by the Diana Award charity, while the Duchess visited the Anna Freud Centre, a leading organisation working in the field of children and young people with mental health issues.
Mental health charity Mind provides advice and support to empower anyone experiencing a mental health problem.
Every year, Mind in Harrow helps over 7,000 local people with assistance from over 100 volunteers.
Paul Farmer, the charity's chief executive officer, said about the Duke and Duchess: "Their support will shine a spotlight on mental health and we hope it will spark conversations in households across the country, amplifying the vital message that it's time to talk about mental health.
"We hope it will encourage people to think about the little things we can all do to make a difference to anyone experiencing a mental health problem."