Does lying in a cold bath help lose weight?

Ummm, weird but i honestly don't think that is healthy, don't do it, find another way.

(edit)

This may or may not be bad for your health, and it almost definitely will not help you to lose weight. The only good time for a cold shower is when you're too hot.

You'd be better off altering your diet. Even if it's something as simple as changing your potion sizes to control eating habits. I find that 4 or 5 half-size meals a day keeps me going and helps stop snacking.