According font-awesome docs here, after install package yarn add --dev @fortawesome/fontawesome-free or npm install --save-dev @fortawesome/fontawesome-free Require font-awesome into your config file (in my case and default Symfony 4 location) assets/js/app.js: require('@fortawesome/fontawesome-free/css/all.min.css'); require('@fortawesome/fontawesome-free/js/all.js'); Compile again yarn encore dev and icons should appear.

font awesome symfony encore

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