**About** *The Worldwide Megadataset* is a huge dataset containing variables measuring aspects of countries or persons by their countries of origin. It is freely available to everyone. The dataset was made with code written by Emil OW Kirkegaard that can merge two existing datasets. The motivation for this was that merging datasets manually was a lot of work due to them: 1) not having the exact same countries in them, 2) using different names for the same countries, and thus 3) the countries were not even in the same order. The dataset is maintained by Emil OW Kirkegaard and John Fuerst. **Variables** There is [a Google Drive file][1] with information about variables that appear in the dataset. As of version 1.6b, there are 296 variables concerning 269 countries or regions. The old website for the dataset is [here][2]. **Source code** The database merger is written in R, ported from an earlier version in Python. The country name-to-ISO-3 translator is still in Python but will get translated "soon". The source code is in the repository. [1]: https://docs.google.com/document/d/147sMlw2lOYu_8cXRKgVFFNAPjYo0qWedciEbdowmbAU/edit# [2]: http://www.emilkirkegaard.dk/megadataset