About 325,000 Allied troops and 260,000 Germans died in the battle.
Culture Secretary Karen Bradley said it was important to remember the "horrors" of the Ypres battlefields, and honour the memories of the many who died.
'Hell'Officially known as the Third Battle of Ypres, Passchendaele was fought from 31 July to 6 November 1917 in the West Flanders region of northern Belgium.
It is remembered as one of the harshest battles of the war, with heavy rain contributing to the Allies gaining only five miles of ground in three months.
Poet Siegfried Sassoon described the muddy fields as "hell".
Ms Bradley said: "Some of World War One's most defining images of futility, mud, gas attacks and trenches come from these very battlefields.
"As the war recedes into the distance, it is our responsibility to not only mark the years that have gone past, but to keep alive the memories of those who sacrificed so much."
The main ceremony will be on 31 July at the Commonwealth War Graves Commission's Tyne Cot Cemetery, where 12,000 British and Commonwealth troops are buried.
There will also be a traditional Last Post ceremony at the Menin Gate memorial in Ypres on 30 July and a number of live performances in Ypres' Market Square to tell the-Read More