What is the rarest Chevy Impala ever made?

There's no single definitive answer to what the rarest Chevy Impala ever made is. Rarity depends on several factors including year, trim level, options, condition, and surviving number of examples. Many low-production Impalas from specific years or with unique options could be considered among the rarest. There isn't a central registry tracking every single Impala ever produced to definitively say which is the absolute rarest.