Otis Clapp

Otis Clapp
Clapp, circa 1870
Collector of Internal Revenue for the 4th district of Massachusetts
In office 1862–1875
President	Abraham Lincoln Andrew Johnson Ulysses S. Grant
Preceded by	office established
President of the Boston Board of Aldermen
In office 1860
Preceded by	Silas Peirce
Succeeded by	Silas Peirce
Member of the Boston Board of Aldermen
In office 1860
Member of the Massachusetts House of Representatives
In office 1854
Member of the Boston Common Council from the 6th ward
In office 1845–1846
Personal details
Born	March 3, 1806 Westhampton, Massachusetts
Died	18 September 1886(1886-09-18) (aged 80) Brookline, Massachusetts
Resting place	Walnut Hills Cemetery, Brookline, Massachusetts
Nationality	American
Political party	Republican
Spouse(s)	Ann Willington Emery Porter ​ ​ (m. 1863; died 1843)​ Mary Hadley ​ ​ (m. 1844; died 1871)​
Children	6
Occupation	Publisher, bookseller, homeopath, pharmacist, politician

Otis Clapp (March 3, 1806 – September 18, 1886) was an American publisher, bookseller, homeopath, pharmacist, and politician who served as a collector of Internal Revenue; a member of the Massachusetts House of Representatives; a member and president of the Boston Board of Aldermen; and a member of the Boston Common Council.

Clapp began his career working in publisher. A believer in the New Church (Swedenborgianism), Clapp ultimately turned his focus in this field to New Church-related works.

A promoter of homeopathy, Clapp operated a large homeopathic pharmacy. This namesake business (Otis Clapp & Son) continued as a business after his death, evolving to encompass different areas of medical technology. It was one of the oldest-operating pharmaceutical manufacturers in the United States by the time it was acquired by Medique in 2008. Products continue to be sold by Medique under the brand name "Otis Clapp".

Clapp was a founder of the Massachusetts Institute of Technology.