Rerum may refer to :
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Lacrimae rerum is the Latin for tears for things.
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Rerum novarum is an encyclical issued by Pope Leo XIII on May 16, 1891.
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Rerum Moscoviticarum Commentarii
''Notes on Muscovite Affairs'' (''Rerum Moscoviticarum Commentarii'') (1549) was a Latin book by Baron Sigismund von Herberstein on the geography, history and customs of the Grand Duchy of Muscovy. The book was the main early source of knowledge ...
was a Latin book by Baron Sigismund von Herberstein on the geography, history and customs of Muscovy.
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Rerum Deus Tenax Vigor is the daily hymn for None in the Roman Catholic Breviary.
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Silva rerum
Silva rerum (plural: ''silvae rerum'', Latin for "forest of things"; also Polonized as sylwa, sometimes described as home chronicle) was a multi-generational chronicle kept by many Polish and Lithuanian noble families from the 16th through 18th ...
was a specific type of a book, a multi-generational chronicle.
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