Django - {% csrf_token %} was used in a template, but the context did not provide the value

Your index.html is rendered without RequestContext. Try this:

def index(request):
    return render_to_response('index.html', context_instance=RequestContext(request))

I also recomend you to use more convenient shortcut render:

from django.shortcuts import render

def index(request):
    return render('index.html')

From docs:

render() is the same as a call to render_to_response() with a context_instance argument that forces the use of a RequestContext.

EDIT:

Thanks @nerdwaller for mentioning, newer versions now needs:

render(request, 'index.html', {params});

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