| Mohawk Hudson Humane SocietyEIN 14-1338459 | Animals | NY | $3,033,879Small | 88.69 |
| Mohonk PreserveEIN 14-1609484 | Environment | NY | $4,259,553Mid-sized | 81.21 |
| MoMA PS1EIN 23-7379091 | Arts, Culture, Humanities | NY | $9,938,950Mid-sized | 82.27 |
| Monadnock Humane SocietyEIN 02-6005610 | Animals | NH | $1,212,684Small | 84.04 |
| Monadnock United WayEIN 02-0236885 | Community Development | NH | $2,165,227Small | 89.02 |
| Monell Chemical Senses CenterEIN 23-2020897 | Health | PA | $13,342,596Mid-sized | 86.45 |
| Monmouth County SPCAEIN 21-0679893 | Animals | NJ | $5,004,059Mid-sized | 83.71 |
| Montclair Art MuseumEIN 22-1487582 | Arts, Culture, Humanities | NJ | $4,778,160Mid-sized | 87.47 |
| Montgomery County Food BankEIN 76-0153892 | Human Services | TX | $20,386,409Large | 89.99 |
| Montgomery County Humane SocietyEIN 52-6044968 | Animals | MD | $1,086,644Small | 82.30 |
| Montgomery County Women's CenterEIN 76-0061208 | Human Services | TX | $5,849,609Mid-sized | 89.33 |
| Montpelier FoundationEIN 31-1620682 | Arts, Culture, Humanities | VA | $11,496,518Mid-sized | 86.75 |
| Morgan Memorial Goodwill IndustriesEIN 04-2106765 | Human Services | MA | $26,744,337Large | 86.46 |
| MorningStar Mission MinistriesEIN 36-2422510 | Human Services | IL | $6,723,363Mid-sized | 89.50 |
| Morris Animal FoundationEIN 84-6032307 | Animals | CO | $10,893,273Mid-sized | 81.92 |
| Morton Plant Mease FoundationEIN 59-1751535 | Health | FL | $9,663,293Mid-sized | 88.73 |
| Mosaic Youth Theatre of DetroitEIN 38-3069610 | Arts, Culture, Humanities | MI | $1,493,069Small | 83.17 |
| MOSIEIN 59-2657399 | Arts, Culture, Humanities | FL | $6,806,453Mid-sized | 82.73 |
| Mother Caroline Academy & Education CenterEIN 04-3163180 | Education | MA | $2,529,195Small | 85.11 |
| mothers2mothersEIN 30-0545760 | International | CA | $4,284,671Mid-sized | 80.54 |
| Motion Picture and Television FundEIN 95-1652916 | Human Services | CA | $58,204,376Large | 84.86 |
| Moultrie YMCAEIN 58-0593424 | Human Services | GA | $3,989,387Mid-sized | 85.15 |
| Mount Carmel MinistriesEIN 41-1577937 | Religion | MN | $1,230,287Small | 85.10 |
| Mount Washington ObservatoryEIN 02-0225135 | Research and Public Policy | NH | $2,066,258Small | 81.07 |
| Mountain States Children's HomeEIN 84-0516736 | Human Services | CO | $2,131,358Small | 80.89 |
| Mourning Family FoundationEIN 65-1075983 | Human Services | FL | $2,110,264Small | 81.40 |
| Move America ForwardEIN 84-1627277 | Human Services | CA | $2,977,679Small | 87.25 |
| Moving TraditionsEIN 34-2015014 | Religion | PA | $2,845,374Small | 89.13 |
| MPN Research FoundationEIN 36-4330967 | Health | IL | $1,929,928Small | 89.03 |
| Muhammad Ali CenterEIN 61-1323046 | Arts, Culture, Humanities | KY | $5,711,406Mid-sized | 89.16 |
| Mujeres Latinas en AcciónEIN 36-2877520 | Human Services | IL | $3,109,740Small | 86.87 |
| Mujeres Unidas Y ActivasEIN 20-2986926 | Human and Civil Rights | CA | $2,249,884Small | 86.54 |
| Multidisciplinary Association for Psychedelic StudiesEIN 59-2751953 | Health | CA | $3,572,643Mid-sized | 84.13 |
| Multiplying GoodEIN 52-0959336 | Education | NY | $2,882,955Small | 83.75 |
| Muncie Mission MinistriesEIN 35-0869061 | Human Services | IN | $1,655,329Small | 81.06 |
| Museum at Eldridge StreetEIN 13-3379555 | Arts, Culture, Humanities | NY | $1,386,823Small | 86.45 |
| Museum of Arts & DesignEIN 13-3585408 | Arts, Culture, Humanities | NY | $12,077,991Mid-sized | 83.32 |
| Museum of Arts & SciencesEIN 59-1022050 | Arts, Culture, Humanities | FL | $3,921,662Mid-sized | 89.39 |
| Museum of Arts and SciencesEIN 58-0806933 | Arts, Culture, Humanities | GA | $1,321,620Small | 87.56 |
| Museum of Aviation at Robins AFB Georgia FoundationEIN 58-1451656 | Arts, Culture, Humanities | GA | $2,635,290Small | 82.04 |
| Museum of Contemporary Art DenverEIN 84-1366092 | Arts, Culture, Humanities | CO | $4,318,686Mid-sized | 83.66 |
| Museum of Contemporary Art San DiegoEIN 95-1855640 | Arts, Culture, Humanities | CA | $8,424,727Mid-sized | 82.72 |
| Museum of Contemporary Art, ChicagoEIN 36-6154098 | Arts, Culture, Humanities | IL | $21,058,376Large | 87.71 |
| Museum of Craft and DesignEIN 55-0830529 | Arts, Culture, Humanities | CA | $1,789,334Small | 81.27 |
| Museum of Danish AmericaEIN 42-1204613 | Arts, Culture, Humanities | IA | $1,401,149Small | 86.43 |
| Museum of DiscoveryEIN 71-0391707 | Arts, Culture, Humanities | AR | $3,204,869Small | 82.95 |
| Museum of Fine Arts, BostonEIN 04-2103607 | Arts, Culture, Humanities | MA | $116,703,506Large | 85.68 |
| Museum of GlassEIN 91-1669422 | Arts, Culture, Humanities | WA | $4,684,363Mid-sized | 86.45 |
| Museum of Latin American ArtEIN 33-0786070 | Arts, Culture, Humanities | CA | $3,997,352Mid-sized | 81.92 |
| Museum of ScienceEIN 04-2103916 | Arts, Culture, Humanities | MA | $62,392,418Large | 87.76 |
| Museum of Science and Industry, ChicagoEIN 36-2167797 | Arts, Culture, Humanities | IL | $64,390,473Large | 85.34 |
| Museum of South Texas HistoryEIN 23-7080936 | Arts, Culture, Humanities | TX | $1,716,549Small | 87.91 |
| Museum of the Moving ImageEIN 11-2730714 | Arts, Culture, Humanities | NY | $6,904,332Mid-sized | 83.07 |
| Museum of Wisconsin ArtEIN 39-1017647 | Arts, Culture, Humanities | WI | $2,108,940Small | 85.51 |
| Music CenterEIN 95-2217011 | Arts, Culture, Humanities | CA | $56,537,029Large | 86.09 |
| Music Center FoundationEIN 23-7298290 | Arts, Culture, Humanities | CA | $7,702,956Mid-sized | 87.47 |
| Music For Life InstituteEIN 31-1746269 | International | WA | $2,952,574Small | 81.68 |
| Music Theatre of WichitaEIN 48-0785658 | Arts, Culture, Humanities | KS | $3,808,004Mid-sized | 88.46 |
| Muslim AdvocatesEIN 30-0298794 | Human and Civil Rights | CA | $1,749,479Small | 81.42 |
| NAFSA: Association of International EducatorsEIN 13-1878953 | International | DC | $21,484,112Large | 85.07 |