Robert Livingston Armstrong (July 4, 1850 – December 3, 1917) was an American professional baseball player.

He played 12 of 21 games, 11 in center field, for the Fort Wayne Kekiongas in the first professional league, the 1871 National Association of Professional Base Ball Players (NAPBBP).

Previously Armstrong played three seasons for the Maryland club of Baltimore, Maryland in the National Association of Base Ball Players.

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