The Otaki by-election of 1900 was a by-election during the 14th New Zealand Parliament. The election was held on 6 January following the death of Henry Augustus Field, and was won by his brother William Hughes Field.

Henry Augustus Field was a Liberal Party Member of Parliament in New Zealand. By profession a surveyor, he retired in his late 20s due to rheumatism and became a farmer. He died in office just two days after having won his second parliamentary election.