God's Word does not give us the "office" of deaconess; however, I have always thought this was an interesting verse.
Romans 16:1-2 says, "I commend unto you Phebe our sister, which is a servant of the church which is at Cenchrea: That ye receive her in the Lord, as becometh saints, and that ye assist her in whatsoever business she hath need of you: for she hath been a succourer of many, and of myself also."
Now if Paul thinks it necessary that all the Roman Christians assist a woman who is a servant of the church, in whatever business she needs you, I suppose this would be similar to what we may call a deaconess today. The Bible does not use as many "labels" as we modern-day Christians do, but we can certainly see distinct principles as we study His Word. There is a lot of controversy on the role of women in the church; God does speak to this directly in many different passages, but we need to be careful not to just pick and choose those that we favor, without comparing the rest of Scripture with Scripture.
Whether you call her a deaconess or not, Phebe was definitely a role model for women in the church.