Delete duplicate items in a single list

The following sample macro searches a single list in the range A1:A100 and deletes all duplicate items in the list. This macro requires that you do not have empty cells in the list range. If your list does contain empty cells, sort the data in ascending order so that the empty cells are all at the end of your list.

Sub DelDups_OneList()
Dim iListCount As Integer
Dim iCtr As Integer

' Turn off screen updating to speed up macro.
Application.ScreenUpdating = False

' Get count of records to search through.
iListCount = Sheets("Sheet1").Range("A1:A100").Rows.Count
Sheets("Sheet1").Range("A1").Select
' Loop until end of records.
Do Until ActiveCell = ""
   ' Loop through records.
   For iCtr = 1 To iListCount
      ' Don't compare against yourself.
      ' To specify a different column, change 1 to the column number.
      If ActiveCell.Row <> Sheets("Sheet1").Cells(iCtr, 1).Row Then
         ' Do comparison of next record.
         If ActiveCell.Value = Sheets("Sheet1").Cells(iCtr, 1).Value Then
            ' If match is true then delete row.
            Sheets("Sheet1").Cells(iCtr, 1).Delete xlShiftUp
               ' Increment counter to account for deleted row.
               iCtr = iCtr + 1
         End If
      End If
   Next iCtr
   ' Go to next record.
   ActiveCell.Offset(1, 0).Select
Loop
Application.ScreenUpdating = True
MsgBox "Done!"
End Sub