Insensato Coração (Irrational Heart) is a Brazilian telenovela produced and broadcast by TV Globo that first premiered 17 January 2011, replacing Passione and ended on 19 August 2011, followed by Fina Estampa.

Directed by Dennis Cavalho and Vinícius Coimbra together with Cristiano Marques, Flávia Lacerda, Maria de Médicis and Luísa Lima.

Starring Antonio Fagundes, Glória Pires, Eriberto Leão, Paolla Oliveira, Lázaro Ramos, Camila Pitanga, Gabriel Braga Nunes, Deborah Evelyn, Herson Capri, Deborah Secco, Juliano Cazarré, Ana Lúcia Torre, Natália do Vale, Nathalia Timberg and Tarcísio Meira.

Not only does the relentless Leo manage to edge aside his brother in the eyes of Marina, but he also succeeds in deceiving Norma, a naïve nurse who develops a genuine affection for him.

Before long, irrational actions transform two once-happy brothers into bitter rivals with Pedro demanding justice for Leo's misconduct.