Worldwide International Days / Holidays in 2018.
| Date | Weekday | Holiday Name |
| Jan-04 | Thursday | World Braille Day |
| Jan-07 | Sunday | International Programmers’ Day |
| Jan-21 | Sunday | World Religion Day |
| Jan-26 | Friday | International Customs Day |
| Jan-28 | Sunday | World Leprosy Day |
| Feb-02 | Friday | World Wetlands Day |
| Feb-11 | Sunday | World Day of the Sick |
| Mar-01 | Thursday | Self-Injury Awareness Day |
| Mar-08 | Thursday | World Kidney Day |
| Mar-24 | Saturday | Earth Hour |
| Apr-01 | Sunday | April Fool’s Day |
| Apr-13 | Friday | Friday the 13th |
| Apr-18 | Wednesday | International Day for Monuments and Sites |
| Apr-20 | Friday | Global Youth Service Day |
| May-08 | Tuesday | World Ovarian Cancer Day |
| May-12 | Saturday | International Nurses Day |
| May-20 | Sunday | World Autoimmune Arthritis Day |
| May-25 | Friday | African Liberation Day |
| Jul-13 | Friday | Friday the 13th |
| Aug-31 | Friday | International Overdose Awareness Day |
| Sep-04 | Tuesday | World Sexual Health Day |
| Sep-13 | Thursday | International Programmers’ Day |
| Sep-23 | Sunday | International Celebrate Bisexuality Day |
| Sep-29 | Saturday | World Heart Day |
| Oct-01 | Monday | World Vegetarian Day |
| Oct-03 | Wednesday | World Cerebral Palsy Day |
| Oct-11 | Thursday | World Sight Day |
| Oct-29 | Monday | World Stroke Day |
| Nov-01 | Thursday | World Vegan Day |
| Nov-12 | Monday | World Pneumonia Day |
| Nov-17 | Saturday | World Prematurity Day |
| Nov-19 | Monday | International Men’s Day |
International Days / Holidays in 2018 added by Media Nigeria on
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