Find Related Entries with Identical Tags I'm trying to show related entries for a single item.

I want to look up a specific tag(s), and search for any entries that share the same tag(s) then display those related items.

I've read through the documentation and searched around but couldn't find a solution.
Marion's answer is fine but you can also do it a different way, and move the conditional logic out of the for loop. By adding it to the query, you can ask for a specific amount of items to grab, and it won't mess up the loop.index values if you need them.

This is how I would do it.

{% set relatedEntries = craft.entries.relatedTo(tag).id('not ' ~ currentEntry.id).limit(4).find() %}

{% if relatedEntries | length %}
    {% for e in relatedEntries %}
        {# entry stuff here #}
    {% endfor %}
{% endif %}