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is a city in Smith County, Texas, United States. The population was 515 at the 2000 census. It is part of the Tyler, Texas Metropolitan Statistical Area.
Noonday is perhaps best known for the "Noonday onion", reputed to be one of the sweetest onions available. An onion must be grown within a ten mile radius of Noonday in order to be considered a "
". The "Noonday Onion Festival" is held each year in May.
According to the United States Census Bureau, the city has a total area of 2.0 square miles (5.2 km²), all of it land.