If you used ActiveX checkboxes then this:-

Sub UnCheckBoxesActiveX()

Dim objChkBox As OLEObject
With Sheets("Sheet1")
For Each objChkBox In .OLEObjects
If TypeName(objChkBox.Object) = "CheckBox" Then
objChkBox.Object.Value = False
End If
Next
End With
End Sub


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Regards,

OssieMac