From an Evangelical perspective, "The Gospel" means "The Good News". The news, specifically that even though we are sinners, hopelessly separated from God, unable to save ourselves, Christ dies for us, to pay the penalty for our sins.
It is the good news that is revealed to us in the Bible. The Bible is the collection of 66 books (Genesis-Revelations), written over a long period, by different authors, from different backgrounds, yet revealing one unified message, and the Gospel is the message they tell.
I suppose a good analogy would be in standard literature, you have the book (the Bible) and you have the plot (the Gospel).
To muddy the waters, the first four books of the New Testament are called "the Gospels". Each is an account of the life, death, and resurrection of Christ told from the perspective of one of the disciples, who knew Him personally. (Matthew, Mark, Luke, and John)