Hi Biff - ISERROR is a very general error trap in a VLOOKUP, and is usually
better served with ISNA which will trap just the specific issue the OP wants
to cater for.

--
Regards
Ken....................... Microsoft MVP - Excel
Sys Spec - Win XP Pro / XL 97/00/02/03

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It's easier to beg forgiveness than ask permission :-)
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"Biff" wrote in message
...
Hi!

Assume lookup value is in sheet1 A1.

The first lookup table is in sheet2 A1:B5.
The second lookup table is in sheet3 A1:B5.

=IF(ISERROR(VLOOKUP(A1,Sheet2!A1:B5,2,0)),IF(ISERR OR
(VLOOKUP(A1,Sheet3!A1:B5,2,0)),"",VLOOKUP(A1,Sheet 3!
A1:B5,2,0)),VLOOKUP(A1,Sheet2!A1:B5,2,0))

Biff

-----Original Message-----
I would like my vlookup function to look for a value in
one sheet and if it
doesn't find it, look in another sheet. Is this possible?

I was considering using a nested if function but not sure
how.
.