| Louis W. Emerson | |
| State: | New York |
| Term Start: | March 4, 1899 |
| Term End: | March 3, 1903 |
| Predecessor: | Wallace T. Foote Jr. |
| Successor: | George N. Southwick |
| Office2: | Member of the New York State Senate from the 19th district |
| Term Start2: | January 1, 1890 |
| Term End2: | December 31, 1893 |
| Predecessor2: | Rowland C. Kellogg |
| Successor2: | Amasa J. Parker Jr. |
| Birth Name: | Louis Woodard Emerson |
| Birth Date: | 25 July 1857 |
| Birth Place: | Warrensburg, New York, U.S. |
| Death Place: | Warrensburg, New York, U.S. |
| Resting Place: | City Cemetery |
| Party: | Republican |
| Relatives: | James A. Emerson (brother) |
| Profession: | Politician |
Louis Woodard Emerson (July 25, 1857 – June 10, 1924) was a U.S. Representative from New York.
Born in Warrensburg, New York, Emerson attended the district schools, and was graduated from Warrensburg Academy. He engaged in the lumber, banking, and manufacturing business.
He was a delegate to the 1888, 1892 and 1896 Republican National Conventions.
He was a member of the New York State Senate (19th D.) from 1890 to 1893, sitting in the 113th, 114th, 115th and 116th New York State Legislatures.
Emerson was elected as a Republican to the 56th and 57th United States Congresses, holding office from March 4, 1899, to March 3, 1903.
He resumed former business activities in Warrensburg, New York, and died there June 10, 1924.He was interred in the City Cemetery.
State Senator James A. Emerson was his brother.