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Harold K. L. Castle Foundation


Last Updated: 2016-06-09

At A Glance

Harold K. L. Castle Foundation

1197 Auloa Rd.

Kailua, HI United States 96734-4658

Telephone: (808) 263-7073


Type of Grantmaker

Independent foundation

Additional Descriptor

  • Family foundation

Financial Data

(yr. ended 2014-12-31)

Assets: $198,757,257

Total giving: $4,440,867





Additional Contact Information

E-mail for Ann Matsukado:


Incorporated in 1962 in HI - The foundation was founded by Harold K.L. Castle, a prominent landowner and community leader. Mr. Castle was the owner of Kaneohe Ranch and the land it occupied. He and his wife, Alice Hedemann Castle, were the major contributors to the foundation and were significant figures in the development of modern Hawaii. The land has been divided and sold over the years, but the foundation still owns some of the land and commercial properties as well as investments in stocks and bonds which provide the base from which the foundation's grants are given. The foundation, the largest private foundation based in Hawaii, awards a percentage of these assets each year to nonprofit organizations

Purpose and Activities

As the largest private foundation in the state of Hawaii, the foundation grants approximately $7,000,000 per year to organizations that serve Hawaii. The foundation is currently focusing on three strategic program areas: 1) Public Education Redesign and Enhancement; 2) Near-Shore Marine Resource Conservation; and 3) Windward Oahu.

Program Area(s)

The grantmaker has identified the following area(s) of interest:

Matching Gifts Program

The foundation matches the financial contributions of employees in support of nonprofit organizations in Hawaii. The program encourages foundation employees to increase their personal philanthropic activities by enabling them to “double” their contributions to qualified nonprofits.

Near-Shore Marine Resource Conservation

Affecting immediate and measurable change in our oceans in the near term, and improving governance and management to ensure healthier, resilient, and sustainable nearshore marine ecosystems in the long term via broad-based partnership and an adaptive, community-based approach.

Public Education Redesign and Enhancement

Increasing student achievement by developing instructional leaders, improving the conditions in which they work, and equipping them with new teaching and learning strategies.

Windward Oahu

The foundation helps communities build assets in Windward O‘ahu by strengthening and supporting the region’s rich cultural legacy, its youth and families, and its natural resources.

Windward Youth Leadership Fund

The fund is a way for youth to apply for and earn up to $5,000 for their club or group activities by doing something positive for Windward O‘ahu. Applicants must be 18 or younger, and the club or group must be based in Windward O‘ahu, and have at least three members. Visit foundation web site for sponsoring organizations. Before applying, discuss your project ideas with Todd Cullison ( or Kristen Nalani Mailheau ( You may also call them at 277-5611.

Fields of Interest

  • Community and economic development
  • Education
  • Educational management
  • Elementary and secondary education
  • Elementary education
  • Environment
  • Oceans and coastal waters
  • Youth development
Population Groups
  • Academics
  • Children and youth
  • Students

Financial Data

Year ended 2014-12-31

Assets: $198,757,257 (market value)

Expenditures: $6,499,855

Total giving: $4,440,867

Qualifying distributions: $5,651,406