Wiper party leader Kalonzo Musyoka wants a commission of inquiry formed to investigate the dispute over the 54,000-acre Mwea Trust land in Embu County.
The decades-old disagreement has seen Mbeere, Embu, Kamba and Kirinyaga people claim ownership of the property.
During chaos over the land in 2018, several people were shot.
It was at the memorial service of one of the victims, Mr Kennedy Muvevi Mutua, that Mr Musyoka said a commission was important.
The politician told the government that the team would establish the rightful owners of the land and help end the dispute, as well as ensure the peaceful resettlement of the people.
“The commission, if established, will carry out investigations and identify the genuine land owners so that our people do not continue dying,” he said on Friday at Makima village in Embu County.