A large amount of valuable show jumping was stolen from a container at Cruit Island.
Gardai in Dungloe have launched an investigation into the incident.
The theft, which occurred sometime between the start of April and the end of June, was only discovered recently.
Access was gained to a locked container after the lock was broken and a large quantity of show jumping equipment was stolen.
Items stolen included 12ft poles, cups and show jumps. The equipment stolen would have to have been transported by trailer.
A Garda spokesperson said: “We are hopeful that people involved in the show jumping business may have come across items for sale in recent months on a second hand basis and if this is the case we would like to hear from them.
“Any relevant information should be passed to Milford Garda Station on 074-9153060 or to the Garda Confidential Line on 1800 666 111.”
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