Leopoldo da Gaiche (30 October 1732 - 2 April 1815), born Giovanni Croci, was an Italian Roman Catholic priest and a professed member of the Order of Friars Minor who became well known for wearing a crown of thorns.

Giovanni Croci was born on 30 October 1732 to poor farmers and he lived a pious life which he picked up from his devout parents; he also worked as a shepherd as a child.

Croci was ordained to the priesthood in 1757 after his novitiate where he was regarded as an excellent student; he received his ordination from the Bishop of Terni Cosimo Pierbenedetto Maculari.

In 1809 he climbed a mountain in a protest against the invasion of the Italian nation, led by Napoleon Bonaparte, and planted a tree representing justice and liberty, but the invasion forced him to leave the convent, which was subsequently closed down, and abandon his ministry; he was also briefly imprisoned for his refusal in joining the Napoleonic Republic.

Upon the recognition of his model life of heroic virtue he was proclaimed to be Venerable on 13 February 1855 after Pope Pius IX granted his approval to the Congregation of Rites' findings.