| State1: | Alabama |
| District1: | 4th |
| Term Start1: | March 4, 1899 |
| Term End1: | March 8, 1900 |
| Predecessor1: | William F. Aldrich |
| Successor1: | William F. Aldrich |
| State2: | Alabama |
| District2: | 4th |
| Term Start2: | March 4, 1893 |
| Term End2: | March 13, 1896 |
| Predecessor2: | Louis Washington Turpin |
| Successor2: | William F. Aldrich |
| Birth Name: | Gaston Ahi Robbins |
| Birth Date: | 26 September 1858 |
| Birth Place: | Goldsboro, North Carolina |
| Death Place: | New York City, New York |
| Party: | Democratic |
Gaston Ahi Robbins (September 26, 1858 – February 22, 1902) was a U.S. Representative from Alabama.
Born in Goldsboro, North Carolina, Robbins moved to Randolph County, North Carolina.He attended Trinity College at Durham and was graduated from the University of North Carolina at Chapel Hill in 1879.He studied law.He was admitted to the bar in 1880 and commenced practice in Selma, Alabama.
Robbins was elected as a Democrat to the Fifty-third Congress (March 4, 1893 – March 3, 1895).Presented credentials as a Member-elect to the Fifty-fourth Congress and served from March 4, 1895, to March 13, 1896, when he was succeeded by William F. Aldrich, who contested his election.Presented credentials to the Fifty-sixth Congress and served from March 4, 1899, to March 8, 1900, when he was again succeeded by William F. Aldrich, who contested his election.He resumed the practice of law in New York City, where he died on February 22, 1902.He was interred in Oakwood Cemetery, Statesville, North Carolina.