奔腾4（Pentium 4，或简称奔4或P4），Intel生产的第七代x86微处理器，是继1995年出品的第六代P6架构Pentium Pro之后第一款重新设计过的处理器，这一新的架构称做NetBurst，（此前的Pentium II、Pentium III及相应各版本的Celeron仍旧属于P6架构）。Pentium 4首款产品工程代号为：Willamette，拥有1.4GHz左右的核心时脉，并使用Socket 423脚位架构，于2000年11月发布。值得注意的是，Pentium 4有着非常快速到400MHz的前端总线，之后更有提升到533MHz、800MHz，它其实是一个100MHz时钟频率的四倍数据速率（QDR）前端总线，因此数据传输速率为4×100MHz。相应的，Pentium 4前期的竞争对手AMD Athlon处理器采用双倍数据输率（DDR）前端总线，拥有266MHz或333MHz的数据传输速率（2×133MHz、2×166MHz）。

Pentium 4 was a line of single-core desktop, laptop and entry level server central processing units (CPUs) introduced by Intel on November 20, 2000 and shipped through August 8, 2008. They had a seventh-generation x86 (32-bit) microarchitecture, called NetBurst, which was the company's first all-new design since the introduction of the P6 microarchitecture of the Pentium Pro CPUs in 1995. NetBurst differed from P6 (Pentium III, II, etc.) by featuring a very deep instruction pipeline to achieve very high clock speeds. Intel claimed that NetBurst would allow clock speeds of up to 10 GHz in future chips; however, severe problems with heat dissipation (especially with the Prescott Pentium 4) limited CPU clock speeds to a much lower 3.8 GHz.