"Iran cuts its oil exports to six European countries," Press TV reported.
Press TV said Iran has stopped exporting oil to Netherlands, Greece, France, Portugal, Spain and Italy.
Brent crude oil prices were up $1 a barrel to $118.35 shortly after the announcement.
The EU's 27 member states have decided to stop importing crude from Iran from July 1 over its disputed nuclear programme, which the West says is aimed at building bombs. Iran denies this.
Iran's oil minister said on February 4 that the Islamic state would certainly cut its oil exports to "some" European countries.