You can't do this:
Sheet1.Range("H2:H1000") And Sheet5.Range("D2:D1000")
"Union" is usually the way to do it, but not across sheets. Anyway you don't
need to union them, try

For Each Cell In Sheet1.Range("H2:H1000")
NoDupes.Add Cell.Value, CStr(Cell.Value)
Next Cell
For Each Cell In Sheet5.Range("D2:D1000")
NoDupes.Add Cell.Value, CStr(Cell.Value)
Next Cell

HTH. Best wishes Harald

"Ewing25" wrote in message
...
Im getting a type mismatch error on this code and im not sure why.

Im getting the error on the "Set AllCells" line.

Sub RemoveDuplicates()
Dim AllCells As Range, Cell As Range
Dim NoDupes As New Collection


Set AllCells = Sheet1.Range("H2:H1000") And Sheet5.Range("D2:D1000")
On Error Resume Next
For Each Cell In AllCells
NoDupes.Add Cell.Value, CStr(Cell.Value)

Next Cell
On Error GoTo 0
For Each Value In NoDupes
On Error Resume Next
UserForm3.ListBox1.AddItem Value

Next Value
UserForm3.Show
End Sub


Thanks!
Alex