| Peleg Coffin Jr. | |
| State: | Massachusetts |
| District: | 3rd |
| Term Start: | March 4, 1793 |
| Term End: | March 3, 1795 |
| Alongside: | Shearjashub Bourne (General ticket) |
| Preceded: | Elbridge Gerry |
| Succeeded: | Samuel Lyman |
| Title2: | Treasurer and Receiver-General of Massachusetts |
| Term Start2: | 1797 |
| Term End2: | 1801 |
| Governor2: | Increase Sumner Moses Gill Governor's Council Caleb Strong |
| Predecessor2: | Thomas Davis |
| Successor2: | Jonathan Jackson |
| Title3: | Member of the Massachusetts Senate Nantucket District |
| Term3: | 1795-1796 |
| Office4: | Member of the Massachusetts Senate Nantucket District |
| Term Start4: | 1790 |
| Term End4: | 1792 |
| Predecessor4: | Isaac Coffin |
| Office5: | Member of the Massachusetts Senate Nantucket District |
| Term Start5: | 1785 |
| Term End5: | 1786 |
| Office6: | Member of the Massachusetts House of Representatives Nantucket District |
| Term Start6: | 1783 |
| Term End6: | 1784 |
| Title7: | Member of the Massachusetts House of Representatives |
| Term7: | 1789 |
| Birth Date: | 3 November 1756 |
| Birth Place: | Nantucket, Province of Massachusetts Bay, British America |
| Death Place: | Boston, Massachusetts, U.S. |
| Restingplace: | Mount Auburn Cemetery |
| Nationality: | American |
Peleg Coffin Jr. (November 3, 1756 – March 6, 1805) was an American financier, insurer, and politician from Nantucket and Boston, Massachusetts.
Coffin was born in Nantucket in the Province of Massachusetts Bay to a whaling family; his parents were Peleg and Elizabeth (Hussey) Coffin. Coffin's father was lost at sea a month after he was born. This early background led him to found and head the New England Marine Insurance Company.
Coffin served in the Massachusetts House of Representatives in 1783–1784, and in 1789, and in the Massachusetts Senate from 1785 to 1787, 1789 to 1792, and 1795 to 1796. He was elected to represent Massachusetts in the United States House of Representatives in the 3rd United States Congress from March 4, 1793, to March 3, 1795. Coffin was the Treasurer and Receiver-General of Massachusetts from 1797 to 1801.