Aarushi Talwar was found with her throat slit at the family home in Noida, an affluent town of new shopping malls and offices near Delhi, in 2008. A day later, the body of the family servant, Hemraj, was discovered.
Rajesh and Nupur Talwar were convicted in a local court in Ghaziabad, near Noida, and remanded in custody ahead of sentencing on Tuesday.
Naresh Yadav, a lawyer present in court, told reporters waiting outside that the couple and members of their family broke down in tears when the verdict was read out.
Early in the investigation, police alleged Rajesh had murdered his daughter and servant in a rage after finding them in a compromising situation - the kind of crime more often associated with rural, conservative parts of India where "honour killings" are not uncommon.