Private company

Harold K.L. Castle Foundation

Logo: castlefoundation.org3

Private foundation from Hawaii, USA

The Harold K.L. Castle Foundation it is the largest private foundation headquartered in the State of Hawaii.2 It was founded by Harold Kainalu Long Castle.1 Wikipedia text CC BY-SA 4.0

Last updated Oct 21, 2026.

Overview

The Harold K.L. Castle Foundation it is the largest private foundation headquartered in the State of Hawaii.2

The story

Founded by Harold Kainalu Long Castle.1

Founder Harold Kainalu Long Castle was the owner of Kaneohe Ranch. The Castle Medical Center was named after Harold K.L. Castle's father, James Bicknell Castle. The foundation has contributed more than $8 million to the medical center and more than $143 million in grants.

Since 2000, the foundation has granted more than $60 million; more than $50 million has gone to organizations serving the Windward side of Oahu.

Foundation disburses an average of $7,000,000 in grants per year.

The foundation provides grants from $500 to $5,000 to Windward youth group activities that include community service.

Investments include grants for the Bishop Museum, Teach for America and stem cell research.

From Wikipedia’s article on Harold K.L. Castle Foundation, shared under CC BY-SA 4.0.4

Leadership

Who has led Harold K.L. Castle Foundation, and when. Pick a name to see everywhere that person has worked.

Sources

The numbers on this page point here. Each one links to the record it came from.

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