William L. Pfeiffer | |
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| Member of the U.S. House of Representatives from New York's 42nd district | |
| In office January 3, 1949 – January 3, 1951 | |
| Preceded by | Walter G. Andrews |
| Succeeded by | William E. Miller |
| Personal details | |
| Born | May 29, 1907 Buffalo, New York, US |
| Died | July 22, 1985 (aged 78) Glens Falls, New York, US |
| Political party | Republican |
William Louis Pfeiffer (May 29, 1907 – July 22, 1985) was a Republican politician who served one term as a member of the United States House of Representatives from New York.