Siebel may refer to:
Companies
- Siebel, a German aircraft manufacturer founded in 1937 in Halle an der Saale
- Siebel Systems, a software company principally engaged in the design, development, marketing and support of customer relationship management (CRM) applications.
People
- Fritz Siebel (1913 – 1991), an Austrian American illustrator
- Jennifer Siebel Newsom (born 1974), an American documentary filmmaker and First Lady of California since 2019
- Pablo Siebel (born 1954), a Chilean painter
- Paul Siebel (born 1937), an American singer-songwriter and guitarist
- Thomas Siebel, a business executive
- Wigand Siebel (born 1929), a German sociologist
- a character in the opera Faust
Siebels may refer to:
- George G. Siebels, Jr. (born 1913), the first Republican Mayor of Birmingham, Alabama
- Jon Siebels, (born 1979), the guitarist in the band Eve 6
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