The 250 nm process (250 nanometer process or 0.25 μm process) is a level of semiconductor process technology that was reached by most manufacturers in the 1997–1998 timeframe.

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• The DEC Alpha 21264A, which was made commercially available in 1999.
• The AMD K6-2 Chomper and Chomper Extended. Chomper was released on May 28, 1998.
• The AMD K6-III "Sharptooth" used 250 nm.
• The mobile Pentium MMX Tillamook, released in August 1997.
• The Pentium II Deschutes.
• The Pentium III Katmai.
• The Dreamcast's CPU and GPU.
• The initial version of the Emotion Engine processor used in the PlayStation 2.

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