Secchi may refer to:
People with the surname Angelo Secchi, Italian astronomer Giuseppe Secchi (1931–2018), Italian footballer Luciano Secchi (born 1939), Italian comic book writer and publisher Luigi Secchi (1853-1921), Italian sculptor Marco Secchi, Italian photographer Serafino Secchi (died 1628), Italian clergyman
Other uses Secchi (lunar crater) Secchi (Martian crater) Secchi depth, a measure of turbidity Secchi disk, an instrument used to measure turbidity SECCHI (Sun Earth Connection Coronal and Heliospheric Investigation), an instrument package on each of the STEREO spacecraft