Silence Day or Day of Silence could refer to
- Silence Day, (July 10) when followers of Meher Baba commemorate the day he began his lifelong silence
- Day of Silence, the annual day of action (in April) 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) according to the Balinese saka calendar.
- The internet radio Day of Silence when internet radio protests against royalty rate hikes