The Italian firm has already had banners on display at the season-opening round at Phillip Island.
“The arrival of Fassi Gru as new Official Sponsor ensures the eni FIM Superbike World Championship a new high-profile international partner," said WSBK commerical and marketing director Marc Saurina.
"This partnership will be of great benefit for both and will bring further prestige to the series, considering the worldwide presence and proven professionalism of Fassi Gru.
"It also demonstrates once again that the SBK represents an efficient communication tool for those Companies sharing the same target range.”
Chief executive Giovanni Fassi said: “Becoming part of one of the top world motorsport championships means great pride for us.
"We’re enthusiast about this new partnership with the eni FIM Superbike World Championship. Our wish is this collaboration shall bring mutual success.
"Our company shares common values with SBK, technological innovation and team work.”