I am a resident of UAE on employment visa and hold a Pakistani passport. I am travelling to UK and want to to visit Dublin also. I have a UK visit visa on my passport. Can I do that or I need a separate visa for Dublin (Ireland)?
According to the Irish Naturalisation and Immigration Service, Holders of Pakistani passports will need a visa to enter.
There is talk of allowing those who already hold a visa for the UK and NI will be able to go between the two and Ireland without a visa, but so far, this has only been applied to Chinese passport holders, so yes, you will need to get another visa to go to Dublin.
http://www.inis.gov.ie/en/INIS/Pages/British%20Irish%20Visa%20Scheme about 2 years ago