In Germany we have two similar holidays.

The 8th of May is the “Tag der Befreiung” (Liberation Day), which commemorates the end of the National Socialist rule and probably comes closest to the Italian Liberation Day.

And in November (two weeks before the first Sunday in Advent) there’s the “Volkstrauertag” (People’s Mourning Day) to remember all nation’s victims of war and tyranny.

Apart from that, there is of course also the International Holocaust Remembrance Day on the 27th of January, the anniversary of the liberation of the Auschwitz concentration camp.