| 38851 | April 4 | Birth | 1987 – Marcos Vellidis, Greek footballer |
| 38852 | April 4 | Birth | 1988 – Frank Fielding, English footballer |
| 38853 | April 4 | Birth | 1989 – Vurnon Anita, Dutch footballer |
| 38854 | April 4 | Birth | 1989 – Steven Finn, English cricketer |
| 38855 | April 4 | Birth | 1989 – Chris Herd, Australian footballer |
| 38856 | April 4 | Birth | 1989 – Spencer Scott, American porn actress and model |
| 38857 | April 4 | Birth | 1990 – Yūki Mihara, Japanese model |
| 38858 | April 4 | Birth | 1991 – Jack Cooley, American basketball player |
| 38859 | April 4 | Birth | 1991 – Yui Koike, Japanese model and actress |
| 38860 | April 4 | Birth | 1991 – Jamie Lynn Spears, American actress and singer |
| 38861 | April 4 | Birth | 1992 – Lucy May Barker, English actress and singer |
| 38862 | April 4 | Birth | 1992 – Christina Metaxa, Cypriot singer-songwriter |
| 38863 | April 4 | Birth | 1992 – Alexa Nikolas, American actress |
| 38864 | April 4 | Birth | 1993 – Samir Carruthers, English footballer |
| 38865 | April 4 | Birth | 1993 – Frank Kaminsky, American basketball player |
| 38866 | April 4 | Birth | 1994 – Shunsuke Nishikawa, Japanese actor |
| 38867 | April 4 | Birth | 1994 – Risako Sugaya, Japanese singer and actress (Berryz Kobo, Guardians 4, and v-u-den) |
| 38868 | April 4 | Birth | 1996 – Austin Mahone, American singer-songwriter and actor |
| 38869 | April 4 | Birth | 1999 – Miki Nishino, Japanese singer, dancer, and actress (AKB48) |
| 38870 | April 4 | Birth | 2012 – Grumpy Cat, American cat |
| 38871 | April 4 | Death | 397 – Ambrose, Roman archbishop and saint (b. 338) |
| 38872 | April 4 | Death | 636 – Isidore of Seville, Spanish archbishop and saint (b. 560) |
| 38873 | April 4 | Death | 814 – Plato of Sakkoudion, Byzantine monk and saint (b. 735) |
| 38874 | April 4 | Death | 896 – Pope Formosus (b. 816) |
| 38875 | April 4 | Death | 968 – Abu Firas al-Hamdani, Arab general and poet (b. 932) |
| 38876 | April 4 | Death | 1284 – Alfonso X of Castile (b. 1221) |
| 38877 | April 4 | Death | 1292 – Pope Nicholas IV (b. 1227) |
| 38878 | April 4 | Death | 1536 – Frederick I, Margrave of Brandenburg-Ansbach (b. 1460) |
| 38879 | April 4 | Death | 1588 – Frederick II of Denmark (b. 1534) |
| 38880 | April 4 | Death | 1596 – Philip II, Duke of Brunswick-Grubenhagen (b. 1533) |