Erdogan, who has dominated Turkey since 2003 as premier and now president, narrowly won the April 16 referendum on enhancing his powers which supporters believe will lead to better government but critics say creates one man rule.
Turkey's Information and Communication Technologies Authority (BTK) said it had implemented the ban against online encyclopedia with an administrative order.
Erdogan said on Tuesday that Turkey would not wait forever to join the bloc, just a day after the EU executive's top official for membership talks asked Europe's foreign ministers to consider other types of ties with Turkey when they meet on Friday.
Ties between EU states and their NATO ally Turkey soured in the aftermath of a failed coup last July as the bloc was taken aback by Erdogan's sweeping security crackdown that followed.
Turkish people, I will always stand with you to fight for this right."A block affecting all language editions of the website in Turkey was detected from 0500 GMT after an administrative order by the Turkish authorities, according to the Turkey Blocks monitoring group, which follows internet restrictions in the country.