Foundations starting with O
160 private foundations with profiled giving history. Figures from IRS 990-PF filings. Search every letter at once.
Typical grant is the median of grants reported in the filing data. Application details come from the latest filing and can be out of date, so confirm them with the foundation.
101–160 of 160 foundations in this list.
| Foundation | Typical grant | Total giving | Grants reported |
|---|---|---|---|
| Oro Y Plata Foundation IRS filing 2024 · Most giving: MT, GA, CA | $25K | $1.8M | 84 |
| Otter Tail Power Company Foundation IRS filing 2025 · Most giving: MN, ND, SD | $1.2K | $1.7M | 389 |
| Ochylski Family Foundation IRS filing 2024 · Most giving: IA, PA, FL | $90K | $1.7M | 14 |
| One World Fund IRS filing 2025 · Most giving: NY, CA, DC | $19.5K | $1.7M | 73 |
| Oldham Little Church Foundation IRS filing 2024 · Most giving: TX, OH, IN | $14K | $1.7M | 129 |
| Oberweiler Foundation IRS filing 2025 · Most giving: IL, PA, VA | $15K | $1.7M | 104 |
| The Ottosen Family Foundation IRS filing 2025 · Most giving: AZ, VA, IL | $48.1K | $1.7M | 29 |
| Ohel Naftoly IRS filing 2024 · Most giving: NY, NJ, NC | $2.7K | $1.7M | 76 |
| Orosz Family Foundation Inc IRS filing 2024 · Most giving: PA, FL, CA | $25K | $1.7M | 27 |
| Outcalt Foundation IRS filing 2024 · Most giving: CO, FL, TN | $5K | $1.6M | 37 |
| Op & We Edwards Foundation Inc IRS filing 2024 · Most giving: MT, OH, VT | $20K | $1.6M | 63 |
| One Accord Charity Foundation IRS filing 2025 · Most giving: Tsuen Kwan O, WA, CA | $53.8K | $1.6M | 20 |
| O'Connell Family Foundation Inc C/O Daniel S O'Connell IRS filing 2024 · Most giving: RI, NY, MA | $5K | $1.6M | 15 |
| Ordean Foundation IRS filing 2024 · Most giving: MN, WI | $20K | $1.5M | 50 |
| Ogc Charitable Foundation IRS filing 2025 · Most giving: VA, CT, OH | $67.6K | $1.5M | 18 |
| The O'Brien Family Foundation IRS filing 2025 · Most giving: CA, TX, NY | $5K | $1.5M | 107 |
| Ossen Family Foundation IRS filing 2025 · Most giving: CT, NH, NY | $2.2K | $1.5M | 132 |
| Oluv C Joynor Foundation Inc IRS filing 2024 · Most giving: MD, PA, VA | $15K | $1.5M | 55 |
| O'Neill Family Charitable Foundation IRS filing 2024 · Most giving: MA, FL, OH | $15K | $1.5M | 11 |
| The O-I Charities Foundation IRS filing 2024 · Most giving: OH, DC, PA | $600 | $1.4M | 187 |
| The Oros Foundation IRS filing 2025 · Most giving: AL, GA | $125K | $1.4M | 8 |
| Opus Prize Foundation C/O Adler Trust Company IRS filing 2024 · Most giving: NY, LA, MA | $10K | $1.4M | 14 |
| Orin Smith Family Foundation IRS filing 2024 · Most giving: WA, DC | $25K | $1.4M | 12 |
| Our Home Ukraine Foundation IRS filing 2025 · Most giving: IL, FL, CA | $174K | $1.3M | 7 |
| Oppenheim Family Fund Inc IRS filing 2024 · Most giving: NY, ME, CT | $2.5K | $1.3M | 181 |
| Orris C&B Dewey Hirtzel Memorial Fd IRS filing 2024 · Most giving: PA, NY, IN | $7.5K | $1.3M | 52 |
| Overton & Katharine Dennis Fd-Cust IRS filing 2025 · Most giving: VA, WA, MD | $10K | $1.3M | 90 |
| Oliver Charitable Corporation IRS filing 2025 · Most giving: AR | $50K | $1.3M | 13 |
| Ocie V Miller Memorial Foundation Inc IRS filing 2024 · Most giving: IN, IL, CA | $100K | $1.3M | 11 |
| Olsson Foundation Inc IRS filing 2025 · Most giving: NE, CO, AZ | $2.5K | $1.3M | 54 |
| Oatey Foundation IRS filing 2025 · Most giving: OH, TN, FL | $10K | $1.3M | 56 |
| One Earth Future Foundation Inc IRS filing 2024 · Most giving: CO, DC, NJ | $5K | $1.2M | 5 |
| Outride fka The Specialized Foundation IRS filing 2024 · Most giving: NM, CA, NY | $12.4K | $1.2M | 103 |
| Our Little Light Foundation IRS filing 2024 · Most giving: CA, IL, NY | $20K | $1.2M | 41 |
| Oliver & Cunningham Fam Fdn-Main IRS filing 2025 · Most giving: IN, MI, NY | $12.5K | $1.2M | 50 |
| Otzar Hachesed Foundation Trust IRS filing 2025 · Most giving: NY, NJ, FL | $9.1K | $1.2M | 64 |
| The Orchard House Foundation -A Nevada Non Profit Corporation IRS filing 2025 · Most giving: CA, NV, NY | $20K | $1.2M | 54 |
| Opera House Fund Inc C/O Doug Dean IRS filing 2024 · Most giving: KY | $28K | $1.2M | 26 |
| Orion & Emma B Hurlbut Tr Fbo Memorial Fd IRS filing 2024 · Most giving: TN | $150K | $1.2M | 7 |
| Open Stewardship Foundation IRS filing 2025 · Most giving: CA, TX | $5K | $1.2M | 169 |
| Otter Tail Corporation Foundation IRS filing 2025 · Most giving: MN, ND, AZ | $5K | $1.1M | 119 |
| Oakland Family Foundation IRS filing 2025 · Most giving: MT | $25K | $1.1M | 31 |
| OShea Family Foundation IRS filing 2024 · Most giving: TX, NY, MI | $10K | $1.1M | 30 |
| Overlake Foundation Inc IRS filing 2024 · Most giving: TX, CA, ME | $6K | $1.1M | 56 |
| Oracle Education Foundation IRS filing 2024 · Most giving: CA, TX, MO | $15K | $1.1M | 8 |
| The Otto M Budig Family Foundation IRS filing 2025 · Most giving: OH, KY | $25K | $1.1M | 15 |
| Osaic Foundation Inc IRS filing 2024 · Most giving: NY, MO, MA | $1K | $1.1M | 281 |
| The Oxley Foundation IRS filing 2025 · Most giving: OK | $50K | $1.1M | 8 |
| Open Minds Align Foundation Inc IRS filing 2025 · Most giving: FL, PA, OH | $4K | $1.1M | 74 |
| Orsa Foundation IRS filing 2025 · Most giving: MI, MO, UT | $8K | $1M | 93 |
| Ocora Foundation IRS filing 2025 · Most giving: MN | $77.5K | $1M | 16 |
| O'Donnell Family Charitable Trust Joseph Matzkin Esq Trustee IRS filing 2025 · Most giving: MA | $5K | $1M | 8 |
| OneAmerica Foundation Inc IRS filing 2024 · Most giving: IN, DC, VA | $8K | $1M | 68 |
| Olander Family Foundation Inc IRS filing 2025 · Most giving: CA, OH, NV | $4K | $1M | 204 |
| Ohio National Foundation IRS filing 2025 · Most giving: OH | $10.7K | $1M | 6 |
| The Old Oak Foundation IRS filing 2024 · Most giving: CA, NY, VA | $25K | $1M | 21 |
| Otto & Edna Neely Foundation IRS filing 2024 · Most giving: AZ, NC, ID | $10K | $1M | 60 |
| Ozuah Family Foundation Inc Philip Ozuah Director IRS filing 2024 · Most giving: LAGOS, NY, CT | $39.7K | $1M | 14 |
| Oliver Dewey Marcks Foundation IRS filing 2025 · Most giving: MI, OH, PA | $10K | $1M | 68 |
| The Opportunity Foundation IRS filing 2025 · Most giving: VA, DC, NY | $100.5K | $1M | 8 |