How can reference the last item in a list in a Django template? {{ list.-1.key }}

Use the last template tag:

{{ value|last }}

If value is the list ['a', 'b', 'c', 'd'], the output will be the string "d".

In my case I find this solution: {{object_list.last.id}} very useful on expression like this: {% url 'my-url' object_list.first.id object_list.last.id %}

Thanks everyone for you help, it lead me to the realisation that I can use the with tag.

{% with list|last as last %}
    {{ last.key }}
{% endwith %}