Southwest Pass is a narrow strait in Vermilion Parish in southern Louisiana in the United States. It connects the Gulf of Mexico to its south with Vermilion Bay to its north.Webster's New Geographical Dictionary, 1984, p. 1144. It is bounded on the east by Marsh Island (in Iberia Parish) and on the west by the Louisiana mainland in southeastern Vermilion Parish.Webster's New Geographical Dictionary, 1984, pp. 690, 1144.

Southwest Pass should not be confused with a channel in the Mississippi River Delta at the mouth of the Mississippi River also known as Southwest Pass.

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References Webster's New Geographical Dictionary. Springfield, Massachusetts: Merriam-Webster, Inc., 1984. .

External links 731233 (26-Southwest Pass, LA-7) Sectional Elevation of Southwest Pass Lighthouse, Louisiana, 1874