The Lancia Megagamma is a small, almost one-box, concept MPV, designed by Italdesign and introduced at the 1978 Turin Motor Show.

"[4] Featuring high seating h-points measured both off the vehicle floor as well as the pavement and a 0.34 coefficient of drag, the Megagamma used a front engined, front-wheel drive layout based on the Lancia Gamma platform with a Lancia SOHC 2.5 litre flat-4 engine and Bosch L-Jetronic fuel injection.

The Megagamma itself presaged many attributes of the modern MPVs — notably a roomy but compact, flexible cabin with a flat floor[5][6] not unlike such notable antecedents as the Volkswagen Type 2 (1950) and the DKW Schnellaster (1949-1962) and such notable succeeding mini/compact MPV's as the Nissan Prairie (1981), Fiat 500L (2011) and Mitsubishi Chariot (1983) — as well as a wide array of similarly-sized and larger MPV's including the Renault Espace, Honda Shuttle and Chrysler Minivans.

At the time of its debut, Lancia's parent company, Fiat, viewed the concept as too risky[7] and it did not reach production.

However the tall, box-like styling language of the concept would appear again in Giugiaro's later supermini designs for Fiat in the form of the Panda (1980) and Uno (1983).