The Definition of Competent Person
A competent person is an individual capable of identifying workplace hazards and authorized to take corrective action to eliminate them.
A competent person is an individual capable of identifying workplace hazards and authorized to take corrective action to eliminate them.

A competent person is an OSHA-defined designation for an individual who is capable of identifying existing and predictable hazards in the surrounding work environment or working conditions, and who has the authorization from the employer to take prompt corrective measures to eliminate those hazards. This designation appears throughout numerous OSHA standards, including scaffolding, excavation, and fall protection, and requires both the knowledge to recognize hazards specific to the task and the organizational authority to actually stop work or implement corrective action when needed.
Before a crew begins excavation work, the site's designated competent person inspects the soil conditions, confirms the appropriate protective system is in place, and has the authority to halt work immediately if conditions change and present a new hazard.
A competent person is defined primarily by their ability to identify hazards and their authority to take corrective action, while a "qualified person" is generally defined by possessing a recognized degree, certificate, or extensive knowledge and experience in a specific subject; the two designations overlap in some standards but are not interchangeable terms.
OSHA doesn't universally require a specific certification for the competent person designation, though certain standards specify particular training or knowledge requirements; ultimately, the designation depends on demonstrated ability to recognize hazards and the employer's formal authorization for that person to take corrective action.
A competent person must have the authority granted by the employer to take prompt corrective action, which can include stopping work, requiring additional protective measures, or halting a task entirely until an identified hazard is addressed — authority that is essential to the role's effectiveness.