| Company | Type | Based in | Founded |
|---|---|---|---|
| Quaker Oats Company | business, enterprise | Chicago | 1877 |
| Qualcomm | business, public company | San Diego | July 1985 |
| Qualtrics | business, public company | Provo | 2002 |
| Queens Public Library | library network, public library, library | — | 1896 |
| Quiksilver | business, retail chain, enterprise, brick and mortar, public company | Huntington Beach | 1969 |
| Quora | business, online community, enterprise, question-and-answer site, company | Mountain View | June 21, 2010 |
| QVC | television station, business, specialty channel | Düsseldorf | 1986 |