A minute's silence will be observed in the National Assembly and AMs will be able to pay tributes to Nelson Mandela when they meet again on Tuesday.
A book of condolence has also been opened in the Senedd.
Flags have been lowered to half-mast outside the Senedd today and will be lowered again on the day of Nelson Mandela's funeral - Sunday 15th December.
Six-year-old Emma Williams was invited to sit on Nelson Mandela's lap when he visited Wales in June 1998. Now 22, she speaks to ITV News.
Nelson Mandela's first ever television interview was given to ITN reporter Brian Widlake in May 1961.
Former ITV News presenter Sir Trevor McDonald was the first journalist to interview Nelson Mandela after his release from prison in 1990.