Dublin is not a particularly large city and as such it does not have the same level of crime as some other large international cities. However, it would be naive to think there is no crime in Dublin. The best advice is to be aware - make sure you always keep personal belongs such as bags with you at all times. Lock doors and windows in your accommodation. And if you have a bicycle, get a good lock. For extra security, there is a locked bicycle park at the Westland Row Street Gate (beside the O'Reilly Institute) in Trinity. Keys are available from the Students' Union for a small fee and deposit.
If you are, or suspect you are, the subject of a crime, you should contact the Gardaí immediately. If it is an emergency, you should dial 999 or 112 and ask for the Gardaí. Otherwise, call or visit your local Garda Station. The nearest Garda Station to Trinity College is on Pearse Street (01 666 9000).
In College itself, suspected crimes should be reported to Trinity College security guards at any of their desks around college or at the Front Gate office. The contact number for the 24 hour Security Centre in College is 01 896 1317 and the emergency number is 01 896 1999.