Select 2 com icone

//JS
$('.select2').select2({
    templateResult: function(e) {
        icon = $(e.element).attr('data-icon')
        val = e.element;
        if(val){
            val = `<i class="${icon}"></i> ${val.text}`;
        }
        return val;
    },
    escapeMarkup: function(m) {
        return m;
    }
});

//HTML
<select class="select2">
  <option value="1" data-icon="fa fa-users"> TEXTO </option>
</select>