William Louis Hassamaer (July 26, 1864 – May 25, 1910), was a former professional baseball player who played outfielder in the Major Leagues from 1894 to 1896. He played for the Louisville Colonels and Washington Senators.

• List of Major League Baseball players to hit for the cycle

• Career statistics and player information from Baseball Reference, or Baseball Reference (Minors), or Retrosheet
• Bill Hassamaer at Find a Grave

This biographical article relating to an American baseball outfielder born in the 1860s is a stub. You can help Wikipedia by expanding it.

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