The International Operational Service Medal (IOSM, Irish: Bonn Sheirbhís Oibríochta Idirnáisiúnta) is a military decoration awarded by the Government of Ireland to personnel of the Irish Defence Forces who have been deployed on overseas missions by direction of the Government where no other mission medal has been awarded.

The International Operational Service Medal was first awarded to members of the Permanent Defence Forces (PDF) in late 2016 who took part in the response to the West African Ebola virus epidemic (Operation Gritrock) from 2014 onward, after UK forces had offered to award a campaign medal to Irish Defence Forces medical personnel who served alongside them, and the European Union humanitarian response to the European migrant crisis known as Operation PONTUS.

On the reserve side shall be inscribed the wording Bonn Seirbhíse Idirnáisiúnta Oibríochta Óglaigh na hÉireann, 'Defence Forces International Operational Service Medal'.

Straight unswiveled bar through which the ribbon is threaded hanging from a bronze pin-back brooch in which is inscribed Seirbhíse Idirnáisiúnta (International Service).

a. OIC 'A' Admin, having given consideration to the eligibility criteria, will make a recommendation to D COS (Sp) for the award of the medal in respect of the particular mission prior to its deployment.