A duty log was a type of log recording which personnel had been on duty and which tasks had been performed in a specific time.

When Data was shut down in 2368, Geordi La Forge looked through duty logs, personal logs and diagnostics which all provided no clue to why Data was disabled. (TNG: "The Game")

In 2369, Miles O'Brien was infected with the aphasia virus, so Kira Nerys looked through his duty logs for the past two days and discovered he had worked on the replicators in Deep Space 9's command level before becoming aphasic. (DS9: "Babel")

When Frank Darwin was murdered aboard USS Voyager in 2372, duty logs showed that Lon Suder had been the only one in engineering when Darwin came on duty. (VOY: "Meld")

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