Amnesty International made these observations ahead of the key NATO summit starting today in Newport,UK.
Among the agenda for the NATO heads of state and government attending the two-day long event will be the support and training of the Afghan National Security Forces (ANSF) who will take full charge of security in the country by the end of the year.
"With the end of the security transition just a few months away, it is a key time to address the almost total lack of accountability for civilian casualties, which is clearly unlawful and wholly unacceptable," Amnesty's Asia-Pacific Director Richard Bennett said.
"Afghan troops also need much more support for preventing, monitoring and addressing human rights violations," he said.
In a recent report, Amnesty documented the almost complete lack of justice for civilian casualties caused by US and other North Atlantic Treaty Organisation (NATO) forces in Afghanistan.
The report focused mainly on US forces, which have comprised the majority of international forces in the country and have been implicated in the large majority of cases involving civilian casualties.
"While not every civilian death in armed conflict implies a breach of international law," he alleged, "several of the cases Amnesty investigated showed compelling evidence of war crimes by US forces - yet prosecutions have been rare.
