Are these values times?

Or are they text?

If they're text, you could use a formula like:
=SUBSTITUTE(A1,":"," :",1)

If they're times, you could give it a custom format
(format|Cells|number tab|Custom category)
hh :mm:ss

or using a formula and another cell:
=text(a1,"hh :mm:ss")

israel wrote:

Hi,

Is there a formula that would add a space between two characters?

I have "12:13:09", I would like to add a space before the first colon. (12
:13:09)
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smile

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Dave Peterson