National Submarine Day is an annual observance that honors the U.S. Navy’s submarine force and commemorates the anniversary of the first successful test of a submarine, the USS Holland, in 1900.
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National Submarine Day is celebrated annually on April 11th.
| Year | Date | Day |
|---|---|---|
| 2022 | April 11 | Monday |
| 2023 | April 11 | Tuesday |
| 2024 | April 11 | Thursday |
| 2025 | April 11 | Friday |
| 2026 | April 11 | Saturday |
| 2027 | April 11 | Sunday |
| 2028 | April 11 | Tuesday |
| 2029 | April 11 | Wednesday |
| 2030 | April 11 | Thursday |
| 2031 | April 11 | Friday |
| 2032 | April 11 | Sunday |
| 2033 | April 11 | Monday |
| 2034 | April 11 | Tuesday |
| 2035 | April 11 | Wednesday |
