Forty children aged from six to 14 from Syria, Sudan, Libya and elsewhere will parade among thousands of Brazilian youngsters in a spectacle by the Mangueira samba school, the United Nations refugees body UNHCR said in a statement.
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The Mangueira is one of Rio's traditional samba schools competing before 70,000 spectators in the city's Sambadrome stadium.
"Dancing in this world of fantasy, colors and rhythms will be a magical experience for them," said Vivianne Reis, head of I Know My Rights, a charity working with UNHCR.
Tuesday sees the climax of three nights of parades in a fiesta of semi-naked dancing and merriment estimated to attract five million people.