The Alfa Romeo Spider (105/115 series) is a two-seater, front-engined, rear-drive roadster manufactured and marketed by Alfa Romeo from 1966 to 1994 in four distinct generations, or "series", each with modifications ranging from modest to extensive.

As successor to the Giulia Spider, the Spider remained in production for almost three decades. The first three series were assembled by Pininfarina in Grugliasco and the fourth series in San Giorgio Canavese. The last Spider of that series was manufactured in April 1993—the last rear-wheel drive Alfa Romeo before the Alfa Romeo 8C Competizione of 2007.

In 2012, FCA Italy and Mazda studied the possibility of jointly developing a new Spider for 2015 based on the Mazda MX-5 platform. Ultimately, FCA and Mazda chose to manufacture a modern interpretation of the Fiat 124 Sport Spider rather than reviving the Alfa Romeo Spider.