Events that occurred on 4 April.
 On Earth
- 1923 - Actor Peter Vaughan is born.
- 1960 - Actor Hugo Weaving is born.
- 1976 - Gervase Mathew, Inkling, dies.
- 1998 - Tyalië Tyelelliéva issue 12 is published.
- 2009 - The Fourth Grand Council of the Sociedad Tolkien Peruana is held in Lima, Peru.
- 2016 - Actor Erik Bauersfeld dies.