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Delete comment

Windows shortcut 
ShiftF10D
Mac shortcut 
fnShiftF10

In Windows you can delete a comment on the keyboard as follows:

  1. Shift + F10 to open right-click menu
  2. Type "m" to Delete comment

In Excel 2016 on a Mac, you can actually type letters to select menu items in the right-click menu. For example "e" will select "Edit comment". However, there doesn't seem to be a key that selects the Delete comment item. On a Mac, you can use arrow keys:

  1. Shift + F10 to open right-click menu
  2. Arrow keys to Delete comment