Will Europol notify the country that originally submitted my data about my access request?

In most cases, yes. Under Article 36(6), Europol must consult the member state or third country that provided the data before disclosing it to you. This consultation requirement means that the country investigating you will likely learn that you have submitted an access request. This can be strategically significant — in some cases it signals your awareness of an investigation, while in others it may prompt authorities to accelerate proceedings. The decision to submit a request should factor in this notification risk and its potential impact on parallel criminal or extradition matters.