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- India. Sanitary Commissioner.7
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- Indiana State Board of Health, issuing body.1
- Indiana State Medical Association.1
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- Ingalls, William, 1813-19031
- Ingals, E. (Ephraim), 1823-19001
- Ingals, E. Fletcher (Ephraim Fletcher), 1848-191824
- Ingals, E. Fletcher (Ephraim Fletcher), 1848-1918, author2
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- Ingersoll, A. J. (Andrew J.), author2
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- Inglis, David, 1850-1922 author2
- Inglis, David, 1850-1922, author1
- Ingraham, Charles Wilson, author1