Measurement of the structure function FL at HERA

Measurements of the structure function FL performed at the HERA collider are reported. The results are based on the neutral current inclusive e+p scattering cross section measured with e+p data collected at a positron beam energy of 27.6 GeV and proton beam energies at 460, 575 and 920 GeV. The measured structure function FL is consistent with QCD expectations.