How many times is the Holy Ghost mentioned in the Bible?

Answer 1

In the King James translation, "Holy Ghost" is mentioned eighty-nine times; all in the New Testament.

Additionally

The exact phase "Holy Ghost" is not mentioned in the Old Testament, however, many Christian biblical scholars say that references to the "Spirit of the Lord" (e.g. Judges 3:10, Ezekiel 11:5, etc.) or similar phrases in Old Testament is the same reference to the third person of God (namely the Holy Ghost) in New Testament. This view is generally not accepted among non-Christians.