The regulator said in a statement that it would look at any content from the streaming video that the killer had put online that was broadcast by Australian TV stations.
Fifty-one worshippers were gunned down in cold blood as they attended the main prayer session of the week at two mosques in Christchurch. A single man, Australian Brenton Tarrant, is charged with the murders.
Another area of concern was the content made available on the websites of TV stations. The ACMA said though this was beyond its remit, it was talking to the Australian Press Council about coverage of the attack.
It said it would also meet peak industry organisations — Free TV Australia and the Australian Subscription Television and Radio Association — to discuss if current rules provided adequate protection for Australian audiences.