陶瓷刀是使用精密陶瓷高压研制而成的刀具，现今大多用于料理食材。

陶瓷刀具有耐磨、高密度、高硬度、无毛细孔、不会藏污纳垢、非金属铸造不会生锈、切食物无金属味残留、轻薄锐利、易拿易切、清洗容易等优点，具有许多金属制刀具无法取代的特性。

陶瓷刀主要制造原料是二氧化锆，硬度达到8.7（仅次于世界上最硬的天然物质─钻石硬度10）。虽其硬度高，但缺乏韧性固脆，所以使用时应避免摔至地面、外力撞击、除剁刀外则应避免刴或砍等行为，正常使用的情况下可永久都不需要磨刀。

基于保安方面的考虑，生产商一般都在刀身内混入金属粉，使金属探测器都可以侦测出陶瓷刀，还可以稍为增加其韧性。另外，航安方面，就算是无添加金属粉末制的陶瓷刀亦可以X光机侦测出来，故无法带上飞机。

A ceramic knife is a knife made out of very hard and tough ceramic, often zirconium dioxide (ZrO₂; also known as zirconia). These knives are usually produced by dry-pressing zirconia powder and firing them through solid-state sintering. The resultant blade is sharpened by grinding the edges with a diamond-dust-coated grinding wheel. Zirconia is 8.5 on the Mohs scale of mineral hardness, compared to 4.5 for normal steel and 7.5 to 8 for hardened steel and 10 for diamond. This very hard edge rarely needs sharpening.