A sugar refinery is a refinery which processes raw sugar into white refined sugar or that processes sugar beet to refined sugar.

Many cane sugar mills produce raw sugar, which is sugar that still contains molasses, giving it more colour (and any associated nutrients) than the white sugar which is normally consumed in households and used as an ingredient in soft drinks and foods. While cane sugar does not strictly need refining, sugar from beet is almost always refined to remove the strong, almost always unwanted, taste of beets from it. The refined sugar produced is more than 99 percent pure sucrose.