The Bride is described in Revelation:
Rev 21:9-10
9 And there came unto me one of the seven angels which had the seven vials full of the seven last plagues, and talked with me, saying, Come hither, I will shew thee the bride, the Lamb's wife. 10 And he carried me away in the spirit to a great and high mountain, and shewed me that great city, the holy Jerusalem, descending out of heaven from God,
That sure throws a wrench into a lot of theologies and will send a lot of people back into their Bibles.
The bride of Christ is the Church. Rev. 21 make that clear from the description. The new Jerusalem is the Church, the true people of God. It is made up of all the saints from the Old Testament as well as the New Testament, as pictured by the names of the 12 apostles and 12 tribes of Israel.
For Zion's sake will I not hold my peace, and for Jerusalem's sake I will not rest, until the righteousness thereof go forth as brightness, and the salvation thereof as a lamp that burneth. And the Gentiles shall see thy righteousness, and all kings thy glory: and thou shalt be called by a new name, which the mouth of the LORD shall name. Thou shalt also be a crown of glory in the hand of the LORD, and a royal diadem in the hand of thy God. Thou shalt no more be termed Forsaken; neither shall thy land any more be termed Desolate: but thou shalt be called Hephzibah, and thy land Beulah: for the LORD delighteth in thee, and thy land shall be married. For as a young man marrieth a virgin, so shall thy sons marry thee: and as the bridegroom rejoiceth over the bride, so shall thy God rejoice over thee.