Marsh Aviation is an aircraft engineering, design, maintenance and re-manufacturing company, situated on East Falcon Drive, at Falcon Field in Mesa, Arizona. The company often works as a sub-contractor to well-known brand-name aerospace companies, discreetly designing and manufacturing components and sub-systems for high-profile programs. The company has also worked on a variety of aircraft programs for governments all over the world.

Founded in December 1961 to convert piston-powered aircraft to turboprop power, the company's first projects involved fitting Rockwell Thrush Commander agricultural aircraft with Garrett AiResearch TPE-331 engines. Later, the firm also re-engined Gulfstream Turbo Cats, Beech Turbo Mentors and Grumman S-2 Trackers with Garrett engines.

The company filed for Chapter 11 bankruptcy in September 2009.^[1]

Some of Marsh Aviation's aircraft engineering modification programs include:

• Grumman S-2F3AT Turbo Tracker, a re-engined Grumman S-2 Tracker, with Garrett TPE331 engines. Six converted for Argentine Navy.^[2]
• Rockwell/Ayres S2R-T Turbo Thrush airplane, a turboprop conversion of the Rockwell Thrush Commander, using a 600 hp (450 kW) Garrett TPE331-1-101 engine. Deliveries started in 1976.^[3] 75 conversions were completed by 1985.^[4]
• Grumman G164C Turbo Cat airplane, a turboprop conversion of the Grumman Super Ag Cat C/600. Six converted.^[3]

• Gunston, Bill (1993). World Encyclopedia of Aircraft Manufacturers. Annapolis: Naval Institute Press. p. 196.
• Michell, Simon (1994). Jane's Civil and Military Upgrades 1994–95. Coulsdon, UK: Jane's Information Group. ISBN 0-7106-1208-7.
• Taylor, John W. R. (1982). Jane's All The World's Aircraft 1982–83. London: Jane's Yearbooks. ISBN 0-7106-0748-2.
• Taylor, John W. R. (1988). Jane's All The World's Aircraft 1988–89. Coulsdon, UK: Jane's Defence Data. ISBN 0-7106-0867-5.