{{Infoboks virksomhed|wikidata=alle}}
'''Leidos Holdings, Inc.''' ({{nyse|LDOS}}) er en amerikansk forsvars-, luftfarts-, IT- og biomedicinsk virksomhed. De tilbyder videnskabelige-, ingeniørmæssige-, systemintegrations- og tekniske-service.
De har 45.000 ansatte og omsætter for 14 mia. US $.<ref name="leidos.com1">{{Cite web|url=https://www.sec.gov/ix?doc=/Archives/edgar/data/1336920/000133692023000015/ldos-20221230.htm|title=Leidos Holdings, Inc. 2022 Annual Report (Form 10-K) |date=14. februar 2023 |publisher=[[U.S. Securities and Exchange Commission]]}}</ref><ref name=Aitoro1>{{Cite news | last=Aitoro | first=Jill R. | title=What to expect from Leidos and SAIC when they start trading Sept. 30 | url=https://www.bizjournals.com/washington/blog/fedbiz_daily/2013/09/what-to-expect-from-leidos-and-saic.html | work=[[American City Business Journals]] | date=27. september 2013}}</ref>
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