Conrad Poppenhusen (April 1, 1818 – December 12, 1883) was a German American businessman. He was also a philanthropist, a founder of College Point, Queens, and the founder of the first free kindergarten in the United States (on July 1, 1870).
Poppenhusen was born in Hamburg, Germany in 1818.
Poppenhusen worked for a whalebone purchaser before immigrating to the United States in 1843 to start a whalebone processing plant in Brooklyn New York, New York. In 1852 Poppenhusen received a license from Charles Goodyear to produce hard rubber products and subsequently moved the company to a small rural village in Queens.
College Point was founded in 1870 when Poppenhusen incorporated the neighborhoods of Flammersburg and Strattonport together. For his workers in the area, Poppenhusen built housing, the First Reformed Church, and numerous streets.
In 1868 Poppenhusen founded the Flushing and North Side Railroad which connected College Point and Flushing, Queens with ferries to Manhattan. (Today the tracks connect to Manhattan directly via tunnels, but no longer to College Point.) In that same year he also founded the Poppenhusen Institute, containing a vocational high school and in 1870, added the free kindergarten.
After Poppenhusen retired in 1871, his three sons lost much of his fortune, and he declared bankruptcy for over $4 million (at least about $84 million — or perhaps as much as $9 billion — in 2015 dollars).
Poppenhusen married Bertha Marie Henrietta Karker in May 1841. They had four children: sons Adolph (?–?), Heinrich Conrad (1846–?) and Herman Christian (1847–?), and daughter Marie (1849–?).