Judith Mackay | |
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| Born | 1943 (age 80–81) Yorkshire, England |
| Citizenship |  United Kingdom |
| Alma mater | University of Edinburgh |
| Known for | Tobacco control advocate |
| Scientific career | |
| Fields | Public health |
Judith Longstaff Mackay (born 1943 in Yorkshire, England) is a British-born and Hong Kong–based medical doctor and international tobacco control advocate who has led a campaign against tobacco in Asia since 1984, campaigning for tax increases to discourage youth smoking, for the creation of smoke-free areas, and against tobacco promotion. Her main interests are tobacco in low-income countries, women and tobacco, and challenging the transnational tobacco companies.