| Walter Folger Jr. | |
| State1: | Massachusetts |
| District1: | 9th |
| Term Start1: | March 4, 1817 |
| Term End1: | March 3, 1821 |
| Preceded1: | John Reed Jr. |
| Succeeded1: | John Reed Jr. |
| Office2: | Member of the Massachusetts Senate |
| Term2: | 1809-1815 |
| Birth Date: | 12 June 1765 |
| Birth Place: | Nantucket, Province of Massachusetts Bay, British America |
| Death Place: | Nantucket, Massachusetts, U.S. |
| Party: | Democratic-Republican |
| Parents: | Walter Folger Sr. Elizabeth Starbuck Folger |
| Relations: | Phebe Folger Coleman (sister) Lydia Folger Fowler (niece) |
| Profession: | Attorney |
Walter Folger Jr. (June 12, 1765 – September 8, 1849) was a U.S. Representative from Massachusetts.
Born in Nantucket in the Province of Massachusetts Bay, Folger was a member of a large family that included his sister, diarist Phebe Folger Coleman. Notably he was the great-great-great grandson of Peter Folger and Mary Morrell Folger and first cousin three times removed of Benjamin Franklin. Through his mother he is also a member or the Starbuck whaling family of Nantucket.
He attended public schools before studying law. He was admitted to the bar and practiced before serving as member of the Massachusetts State Senate. Folger was elected as a Democratic-Republican to the Fifteenth Congress and reelected to the Sixteenth Congress (March 4, 1817 – March 3, 1821). He resumed the practice of law, and died in Nantucket on September 8, 1849. He was interred in Friends Burying Ground.