A Euro is the official currency of the 19 of the 28 member states of the European Union. Euros are used to purchase goods and services.
Positive: If you dream of yourself converting US dollars to Euros, or vice versa, it could represent that God is about to take you outside of your nation overseas to do ministry, especially in Europe. Dreaming of Euros could indicate that the Lord is going to increase your finances.
Negative: To dream of losing Euros may represent that you have lost a nation that you were called to bring to the Lord. It could also represent having irresponsibility in little things causing God not to trust you with bigger things.
(Psalm 2:8; Deuteronomy 26:9; Psalm 33:12; Luke 16:10).