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| English | Russian |
| Blue Law | 'Закон о скуке', закон о запрете некоторых видов светской деятельности в дни воскресные (In U.S. history, a law forbidding certain secular activities on Sunday) |
| Blue Monday | последний понедельник перед Великим постом у католиков (In the Roman Catholic Church, the Monday before Lent) |
| Blue Mosque | Голубая мечеть (maruschik) |
| Blue Mosque | Мечеть Ахмеда в Стамбуле |
| Blue Mosque | Синяя мечеть (The great mosque built by Ahmed I in 1609-1617 near the Church of Hagia Sophia in Istanbul; it is called so because of the colour of its tile work) |