Suspended government ministers William Ruto and Henry Kosgey, along with broadcaster Joshua Arap Sang, appeared at a pretrial chamber at the ICC. The court verified their identities and informed them of the crimes that they allegedly committed, the ICC said in a statement.
All three are accused of stoking ethnic violence after a disputed 2007 election. Post-election conflict in Kenya left more than 1,000 people dead and another 600,000 displaced.
Three other Kenyan leaders face similar court action this week. The three who appeared before the court Thursday are charged with being involved with post-election political violence in Kenya.
All three deny the allegations.
Ekaterina Trendafilova, the presiding judge in the pretrial court, warned the trio against making any provocative statements.
"There are some movements toward retriggering the violence in the country by way of using some dangerous speeches," she said.
The ICC intervened in the case after the Kenyan government failed to set up an independent tribunal to try the cases at home.