γγ physics and transition form factor measurements at KLOE＼KLOE-2

The KLOE results on the measurement of the transition form factors of the η and π0 mesons in  Dalitz decays are presented, and the determination of the Γ(η→γγ) in γγ collisions is also reported. The prospects for γγ physics of the new data-taking, started in November 2014 with the upgraded detector, are reviewed.