This book constitutes the proceedings of the 4th International Conference on Electronic Voting, E-Vote-ID 2019, held in Bregenz, Austria, in October 2019. The 13 revised full papers presented were carefully reviewed and selected from 45 submissions. The conference was organized in tracks on security, usability and technical issues, administrative, legal, political and social issues, elections and practical experiences, posters and e-voting system demo.