Who was Judas?

One of the 12 Apostles -- he betrayed Jesus Christ

The Treasurer

What was Judas, and what office did he hold?
John: "He was a thief, and had the bag, and bare what was put therein" (xii, 6).
Judas was thus the first Christian treasurer. But why did Jesus, if omniscient, as claimed, select a thief for this office? Was he unable to conduct his ministry without the aid of one?
see link on right
Judas Iscariot was one of the 12 disciples. He betrayed Jesus for 30 peaces of silver.

Additionally

Note that a second apostle was also named Judas but he was the son of James that was mentioned in Luke 6:16. In the Gospel of Mark he is called Thaddaeus where this was his Greek name and Judas was his Jewish name.

 

Another answer:

The New Testament makes reference to at least six men called Judas.

1. The most-often mentioned is Judas Iscariot, betrayer of Jesus. (In reference to him, scripture almost always specifies "Iscariot," or reminds the reader that he betrayed Jesus, as in Matt. 27:3 and John 18:2.) His father's name was Simon (John 13:26).
2. Another apostle, also known as Thaddeus or Lebbaeus, mentioned in the answer above, whose father's name was James (Luke 6:16). John 14:22 refers to him as "Judas (not Iscariot)."
3. A half-brother of Jesus (Matthew 13:55).
4. A prophet surnamed Barsabas, of the church at Jerusalem (Acts 15:22)
5. A Jew of the city of Damascus (Acts 9:11)
6. A false messiah from Galilee (Acts 5:37)