PROBA (Project for On-Board Autonomy) was a Belgian satellite launched atop an Indian Polar Satellite Launch Vehicle by ISRO in 2001. The satellite was funded through the ESA's MicroSat program. This small (40×60×80 cm; 95 kg) boxlike system, with solar panel collectors on its surface, has remarkable image-making qualities. It hosts two Earth Observation instruments dubbed CHRIS and HRC. It is a hyperspectral system (200 narrow bands) that image at 30 m, plus three in the visible that have 15 m resolution.

Proba may refer to:

• Faltonia Betitia Proba, fourth-century Latin poet
• Anicia Faltonia Proba, her niece and the recipient of letters from Saint Augustine and Saint John Chrysostom
• Próba, Lódz Voivodeship, village in the administrative district of Gmina Brzeznio, within Sieradz County, Lódz Voivodeship, in central Poland.
• Proba, Leningrad Oblast, settlement in Russia
• PROBA, series of low-cost satellites from the European Space Agency

Próba is a village in the administrative district of Gmina Brzeznio, within Sieradz County, Lódz Voivodeship, in central Poland. It lies approximately east of Brzeznio, south-west of Sieradz, and south-west of the regional capital Lódz.