Silence Day or Day of Silence may refer to:

• Silence Day, 10 July, when followers of Meher Baba commemorate the day he began his lifelong silence
• Day of Silence, a day in April designated to protest the bullying and harassment of lesbian, gay, bisexual, and transgender (LGBT) students
• Nyepi, a Balinese "Day of Silence" that is commemorated every Isakawarsa (Saka new year)

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• Pyramids of mars
• Pyramids of the medulla
• Pyramids of the Sun and Moon
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