Apple - How do I type the euro value sign € on a Mac?

On an American English keyboard you can type the European Currency symbol (€) with Option + Shift + 2.

The Euro Currency symbol is found at ⌥⇧2 on the US English keyboard.

In general, if you want to discover what symbols can be found on your keyboard when you press the modifier keys, you can use the Keyboard Viewer window.

To enable the Keyboard Viewer menu item

1. Make sure System Preferences » Keyboard » Keyboard » Show Keyboard and Character Viewers in menu bar is checked.

2. Make sure System Preferences » Language & Text » Input Sources » Show Input menu in menu bar is also checked.

Once you have the keyboard viewer enabled, go to the keyboard menu in your menu bar (it will look like either a picture of a keyboard or a flag representing the keyboard layout you have selected) and chose Keyboard Viewer. A window will appear with a picture of your keyboard. If you hold down the option, shift, or option and shift keys, it will show you what the keys on your keyboard do with those modifier keys pressed.

On the Euro symbol's own official home page, there's a table of keyboard shortcuts for many national keyboards: http://www.eurosymbol.eu/mac-keyboard Copied and amended here:

keyboard layout keystroke combinations
Austrian        Option-Shift-D
Belgian         Option-$
British         Option-2
Catalan         Option-U
Dutch           Option-2
Finnish         Shift-4
French          Option-$
French (num)    Option -Shift-R
German          Option-E
Italian         Option-I
Italian - Pro   Option-E
Polish          Option-3
Portuguese      Option-3
Slovakian       Option-R
Spanish         Option-U
Spanish - ISO   Option-E
Swedish         Shift-4
Swiss French    Option-E
Swiss German    Option-E
U.S.            Option-Shift-2