The European Conference on Plasma Diagnostics (ECPD) is an event taking place every two years aiming at bringing together scientists and engineers working on plasma diagnostics for magnetic confinement fusion, inertial fusion, beam plasmas, low-temperature and industrial plasmas as well as basic and astrophysical plasmas. The sixth edition of the Conference will be held in Prague, Czechia (April 7th - 10th 2025) and organised by the Institute of Plasma Physics of the Czech Academy of Sciences.