Andrew Onderdonk

Andrew Onderdonk
Andrew Onderdonk circa 1880
Born30 August 1848
Died21 June 1905 (56)
NationalityAmerican
OccupationConstruction contractor
Known forMount Onderdonk in British Columbia was named for him

Andrew Onderdonk (30 August 1848 – 21 June 1905) was an American construction contractor who worked on several major projects in the West, including the San Francisco seawall in California and the Canadian Pacific Railway in British Columbia. He was born in New York City to an established ethnic Dutch family. He received his education at the Rensselaer Polytechnic Institute.

He married Sarah Delia Hilman of Plainfield, New Jersey. After starting his career surveying town sites and roads in New Jersey, he headed west to work as a general manager for financier Darius Ogden Mills on several engineering contracts. He died in Oscawana-on-the Hudson, New York, on June 21, 1905.