The fourth in line to the throne spent his first day in Brazil canoeing to see how it helps rehabilitation for patients with neurological or orthopaedic problems.
The Prince, 29, also visited Rede Sarah Hospital, where he met with doctors, staff and patients before watching a game of wheelchair basketball.
Later in the day, Harry joined in the World Cup action, watching Cameroon play against Brazil at the Estadio Nacional.
Prince Harry looked like he was enjoying himself out on the water.
The young prince looked very dapper in a life jacket.
Harry canoes with patient Israel Lima (front) and an instructor from the Rede Sarah Hospital for Nerological Rehabilitation injuries.
Harry shares a joke with patient Israel Lima.
Prince Harry with Patient Caio Carvalho, aged 11, from the Rede Sarah Hospital for Nerological Rehabilitation injuries.
Prince Harry meets patients at the Rede Sarah Hospital for Nerological Rehabilitation injuries in the hydrotherapy section of the hospital.
Prince Harry and Brazil Minister of Sport Aldo Rebelo celebrate the first goal of Neymar of Brazil.
A sports fanatic, Prince Harry no doubt enjoyed watching the match between Brazil versus Cameroon at the World Cup.