| Alexandra Jones | 1 | Supporters |
| Alexandra Munroe and Robert Rosenkranz | 3 | Supporters |
| Alexandra and Frederick Peters | 11 | Next Stage Campaign, BAM Next Stage Campaign, Supporters |
| Alexandre H. and Lori Chemla | 2 | Next Stage Campaign |
| Alexis Bloom | 2 | Supporters |
| Alfred Lee Peter Mayer Foundation | 1 | BAM Next Stage Campaign |
| Alfred P. Sloan Foundation | 4 | Supporters, Next Stage Campaign |
| Alfred and Stephanie Shuman | 2 | Supporters |
| Aliana and David Spungen | 1 | BAM Next Stage Campaign |
| Alice M. and Thomas J. Tisch Foundation | 2 | Supporters |
| Alice McKown | 2 | Supporters |
| Alice Tisch | 1 | Supporters |
| Alida Brill | 3 | Supporters |
| Alida and Steven H. Scheuer | 1 | Next Stage Campaign |
| Alisa L. Ruvinsky | 2 | Next Stage Campaign |
| Alison Blood | 6 | Supporters |
| Alison Forner and Martha McBrayer | 3 | Supporters |
| Allan Arffa and Kay Matschullat | 8 | Next Stage Campaign, Supporters |
| Allan Sperling | 1 | Next Stage Campaign |
| Allen Sellers | 2 | Supporters |
| Allen and Overy LLP | 3 | Next Stage Campaign, Supporters |
| Allison Cromwell and Craig Falls | 3 | Supporters |
| Allison Fifield | 1 | Supporters |
| Allison Franco | 1 | Supporters |
| Allison M. Blinken | 2 | Supporters |
| Allison and Joe Magliocco | 2 | Supporters |
| Allison and Mark Dunn | 4 | Supporters |
| Allran Electric LLC | 1 | Supporters |
| Almudena and Pablo Legorreta | 1 | Supporters |
| Altman Foundation | 10 | Next Stage Campaign, BAM Next Stage Campaign, Supporters |
| Altria Group, Inc. | 3 | Next Stage Campaign, Supporters |
| Altria Group, Inc. / Next Wave Forward Fund | 11 | BAM Endowment Trust, BAM Endowment Trust Donors, Endowment Trust Donors, Endowment Trust |
| Alvia Golden and Carroll Smith-Rosenberg | 1 | Supporters |
| Alvin Chereskin | 1 | Next Stage Campaign |
| Alvin E. Friedman-Kien and Ryo Toyonaga | 2 | Supporters |
| Alvin J. Rockwell 1990 Charitable Trust | 9 | Next Stage Campaign, BAM Next Stage Campaign, Supporters |
| Alvin and Fanny B. Thalheimer Foundation | 1 | Supporters |
| Alyn Cosgrove | 1 | Supporters |
| Amala and Eric Levine | 1 | Next Stage Campaign |
| Amalia Cosmetatou | 1 | Supporters |
| Amanda Brainerd | 3 | Supporters |
| Amanda Taylor Fund of the Anne Cox Chambers Foundation | 1 | Supporters |
| Amanda Topaz | 1 | Supporters |
| Amatullah Zaahir | 1 | Next Stage Campaign |
| Amazon Studios | 1 | Supporters |
| Amelia Hancock and Steve Klise | 3 | Supporters |
| Amelia and Kevin McCarthy | 1 | Next Stage Campaign |
| American Airlines | 2 | Supporters |
| American Associates of The Old Vic | 1 | Supporters |
| American Chai Trust | 3 | Next Stage Campaign |