...we should search the Scriptures in accordance with the Lord's commandment,     so that we may find eternal life in them.
 ~ St. John 5:39

The Red Egg Project - Orthodox Site - includes several translations of the Bible in Spanish, as well as many other English and other language translations. Excellent!
http://www.redegg.org/

At least three (3) translations of the Bible in Spanish. Can view two versions or languages side-by-side.  http://unbound.biola.edu/

Several Spanish--language translations: http://bible.gospelcom.net/passage/
Or, try: http://bible.gospelcom.net/passage/?search=language=Español

Links for manyBible translations and versions in Spanish & many other languages:
http://www.internetdynamics.com/pub/vc/bibles.html

All Scripture, then, is given by inspiration of God and is also assuredly profitable. Wherefore to search the Scriptures is a work most fair and most profitable for souls. For just as the tree planted by the channels of waters, so also the soul watered by the divine Scripture is enriched and gives fruit in its season, viz. orthodox belief, and is adorned with evergreen leafage, I mean, actions pleasing to God. For through the Holy Scriptures we are trained to action that is pleasing to God.

~ St. John of Damascus, Exposition of the Orthodox Faith