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The Ice Saints is a name given to St. Mamertus, St. Pancras, and St. Servatius in Flemish, French, Dutch, Hungarian, German, Austrian, Polish, Swiss and Croatian folklore. They are so named because their feast days fall on the days of May 11, May 12, and May 13 respectively. In Flanders St. Boniface of Tarsus is counted amongst the Ice Saints as well; St. Boniface's feast day falling on May 14. The period from May 12 to May 15 was noted to bring a brief spell of colder weather in many years, including the last nightly frosts of the spring, in the Northern Hemisphere under the Julian Calendar. The introduction of the Gregorian Calendar in 1582 involved skipping 10 days in the calendar, so that the equivalent days from the climatic point of view became May 22–25.

In Sweden, the German legend of the ice saints has resulted in the belief that there are special "iron nights," especially in the middle of June, which are susceptible to frost. The term "iron nights" (järnnätter) has probably arisen through a mistranslation of German sources, where the term "Eismänner" (ice men) was read as "Eisenmänner" (iron men) and their nights then termed "iron nights," which then became shifted from May to June.

St Pancras railway station, also known as London St Pancras and since 2007 as St Pancras International, is a central London railway terminus and Grade I listed building located on Euston Road in the London Borough of Camden.