Roman Mathias "Lefty" Bertrand (February 28, 1909 – March 17, 2002) was an American Major League Baseball pitcher.

Bertrand played one game for the Philadelphia Phillies in 1936.

On April 15, he pitched the final two innings of the Phillies' 12–4 loss to the Boston Bees at Shibe Park surrendering 2 earned runs while striking out 1.

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