At least 122 children and 56 women were among hundreds of casualties when civilian sites were hit during the conflict, a report says.
US arms giant with a factory in Fife linked to another alleged war crime in Yemen.
The UK government and arms firms based in Scotland were condemned in a Human Rights Watch report for selling weapons to an Egyptian regime that tortures children by waterboarding and electrocution.
Since the Yemen war began in 2015, war crime allegations have been linked to bombs made by US arms firm Raytheon, which has a factory in Fife.
Leonardo is targeting school leavers to work on Typhoon jets which have been used by the Saudis in Yemen's conflict.
Executives of a US arms firm which makes smart bombs in Fife could face investigation for potentially aiding and abetting alleged war crimes in Yemen by a military coalition led by Saudi Arabia.
The Scottish Government has handed nearly £15 million to arms firms with factories in Scotland who sell weaponry to Turkey.
Arms firms in Scotland are failing to make human rights checks which could prevent their products from being used in potential war crimes.
Secretary of State for Scotland Alister Jack registered £70,000 worth of shareholdings two years ago in a private equity group linked to weapons makers.