Is Oreo gluten free?

No. It contains gluten. Why: ingredients list wheat.

Nabisco, Original Chocolate Sandwich Cookies, UPC 044000046989

What the maker says

Not stated

No gluten-free or contains-gluten statement from the maker, and no GFCO listing, is on file.

Ingredients (USDA record)

UNBLEACHED ENRICHED FLOUR (WHEAT FLOUR, NIACIN, REDUCED IRON, THIAMINE MONONITRATE (VITAMIN B1), RIBOFLAVIN (VITAMIN B2}, FOLIC ACID), SUGAR, PALM OIL, SOYBEAN AND/OR CANOLA OIL, COCOA (PROCESSED WITH ALKALI), HIGH FRUCTOSE CORN SYRUP, LEAVENING (BAKING SODA AND/OR CALCIUM PHOSPHATE), SALT, SOY LECITHIN, CHOCOLATE, ARTIFICIAL FLAVOR.

USDA FoodData Central, fdcId 2655838, Nabisco Biscuit Company, published 2023-10-26

Other Oreo flavours differ. Check each one below; a verdict for Original Chocolate Sandwich Cookies doesn't carry over.
FlavourVerdictChecked
Original Chocolate Sandwich CookiesContains gluten2026-10-23
Lemon CremeContains gluten2026-10-23
Chocolate HazelnutContains gluten2026-10-23
Red VelvetContains gluten2026-10-23
GoldenContains gluten2026-10-23
Mint CremeContains gluten2026-10-23

Sources

Source: USDA FoodData Central.