Previously, Griffiths was an assistant editor on the BBC Radio 4 Today programme. Prior to this she worked on BBC live political programmes, election programmes and, before that, at Sky News.
Joe Godwin, BBC Children's head of news, Factual & Entertainment, said: "I'm really pleased Owenna's joining CBBC Newsround, as it's a key time for the programme and our website as we continue to open children's eyes to the world around them.
"It's already well on the way to being a real cross-platform news service for kids, and Owenna's got some very exciting ideas for Newsround and Sportsround."
Owenna Griffiths said: "It's an incredibly important programme and the next few years promise to be the most exciting it has ever had.
"What children watch and where they get their information from is changing all the time. The great thing for Newsround is to seize the opportunity that provides."
Finance reporter - property
