Why was the New Testament Written in Greek? New Testament was written in Greek. But Jesus lived in Israel and was supposed to be the next King of Israel. I think it is probably fair to assume that he and his twelve apostles spoke Hebrew. Then why would the New Testament be written in Greek? I would think at least the Gospels part would be written in Hebrew.
First, actually, it was very likely that Jesus and His followers spoke no fewer than these three languages: Aramaic, Greek, and Hebrew. What language did Jesus speak?

Aramaic was the primary language of the land, Greek was the language of business, education, and for communication with foreigners (because it was a wide-spread language), and Hebrew was the religious language of the Jews and was primarily reserved for prayers, religious teaching, and communication with other Jews.

But why did they choose Greek? Well, first, we don't have the originals of any of the texts, but it is likely that most were written in Greek, however, there is some debate over a few of the books, just for your information. 

The primary reason would be portability. Greek was a very wide-spread language. Hebrew and Aramaic were not. Further, after Peter had an encounter with Gentiles that had him declare that the message of Christ's resurrection was for the Gentile too, it became an international matter that all hear the Good News.


  48 So he ordered that they [Gentiles] be baptized in the name of Jesus Christ. Acts 10:48


Greek was the language that made sense. It was wide-spread, it was for the foreigner, and the Jew knew it as well. Greek was the language that would affect the most people.