Toyo Engineering Corporation (東洋エンジニアリング株式会社, Tōyō Enjiniaringu Kabushiki-gaisha) is a Japanese engineering, procurement and construction company serving mainly the hydrocarbons (oil and natural gas) and petrochemical sectors worldwide.

Its various business include R&D collaboration, design, engineering, equipment procurement, construction, test operations and technical guidance in such areas as general chemicals, petrochemicals, oil refinement, natural gas, electric power, nuclear power, advanced production systems, distribution, medical facilities, biotechnology, environment at each manufacturing plant, procurement, development and sales of systems engineering and other software.

Most of its revenue comes from outside Japan; it has a particular presence in China, India, Indonesia, Iran and Russia.

[5] In the fiscal year ending March 31, 2008, it had sales of 215 billion yen, a net income of 4.45 billion yen, and about a thousand employees.

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