Doctor Elliot Reid is a former attending physician alongside J.D. and Turk at Sacred Heart in Scrubs and is played by Sarah Chalke.  Elliot is very close with J.D. and has an off-and-on again relationship with J.D. throughout the series.  She has also dated several other characters including Sacred Heart doctor Keith Dudemesiter, to who she was engaged to and later broke off the engagement.

Elliot later went into private practice where she was able to make much more money, but still work at Sacred Heart but no longer have to respond to Dr. Cox or Dr. Kelso.

Elliot is extremely insecure and very socially awkward.  She, though is attractive, and slowly becoming more confident throughout the seasons.

Elliot Reid Quotes

So first, my fellowship gets canceled because some jackass cures the disease, and now the only job I can get is working at this crappy free clinic for eight bucks an hour. No one's life could be worse than mine!
(Elliot is revealed to be talking to a double amputee.)

Elliot

Elliot: You have a... penis. And I... have a vagina!
Sean: That is so hot.

Scrubs Quotes

... Turk, Turk, Turk, Turk. I can't talk right now! I'm at your wedding.

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Doug: How long do I have to stay up here?
Janitor: Just until I finish pretending to read the newspaper. Hm! Apparently there was some sort of election held recently.