SOFRETU
{{Short description|French transport consulting firm}}{{More citations needed|date=April 2025}}{{Infobox company
| name = SOFRETU
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| native_name = Société française d'études et de réalisations de transports urbains
| native_name_lang = fr
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| industry = Engineering
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| founded = {{start year and age|1961}}
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| hq_location_country = France
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SOFRETU (Société française d'études et de réalisations de transports urbains) was a French transport consulting and project development firm created in 1961 by the RATP.{{Citation |last=Chastain |first=Andra B. |title=Latin American Subways and Metro Systems |date=2024-12-11 |work=Oxford Research Encyclopedia of Latin American History |url=https://oxfordre.com/latinamericanhistory/display/10.1093/acrefore/9780199366439.001.0001/acrefore-9780199366439-e-1191 |access-date=2025-04-18 |language=en |doi=10.1093/acrefore/9780199366439.013.1191 |isbn=978-0-19-936643-9|url-access=subscription }}{{Cite web |title=History |url=https://www.systra.com/usa/who-we-are/history/ |access-date=2025-04-18 |website=systra.com |language=en}}
It has been merged with [Sofrerail] - a SNCF branch, in 1995 and became Systra.
It has been notably involved in the metro planning for Montréal, Mexico City, Santiago de Chile and Tehran.