Saizeriya (サイゼリヤ) is a Japanese chain of family-style Italian yōshoku restaurants, commonly abbreviated as "Saize" (サイゼ).

[1] Beyond Japan, the restaurant also has a presence in China (including Hong Kong), Taiwan, and Singapore, and has a factory in Melton, Victoria, Australia.

The current president of the company, Yasuhiko Shōgaki, worked at a western restaurant in Ichikawa, Chiba called Saizeriya while he was attending Tokyo University of Science.

[3] The restaurant was in the news in Japan for serving pizza with melamine-tainted dough from China in October 2008.

Ltd. started a chain of fast-food hamburger specialty shops called "Eat Run" (イートラン).

[6] By using prefabricated ingredients in the central kitchen that largely reduces procurement and processing cost, Saizeriya is able to provide Italian cuisine at a lower price.