Riihimäen Lasi was a respected glassworks factory in Finland, operating from 1910 to 1990. The production ranged from household glassware to high quality design glass and crystal. The most known designers working for Riihimäen Lasi were Gunnel Nyman, Timo Sarpaneva, Aimo Okkolin, Erkkitapio Siiroinen, Nanny Still and Helena Tynell. Nowadays many of their products are collectables, especially the colorful vases.

The factory produced handblown glassware and colorful art glass until 1976 and crystal until 1977. After that the production switched to glass- and plastic packaging, until the factory was closed in 1990.