The O 2-class submarine consisted of four submarines built by Koninklijke Maatschappij De Schelde in Flushing for the Royal Netherlands Navy.

Used for patrols in the Dutch home waters.

The class comprised O 2, O 3, O 4 and O 5.

Its diving depth was 25 metres (80 ft); during trials with no crew on board a depth of 40 metres (130 ft) was reached.