Do I need to be rebaptized to take communion in a Catholic Church if I have no proof of my original baptism? I was born in a predominantly Catholic country in Latin America and baptized a Roman Catholic, but I have no physical confirmation of my baptism outside of my recollection of my Catholic upbringing (since I was too young to remember the baptism itself). Having not attended Catholic church since leaving home about twenty years ago, will I need to be baptized again or go through the OCIA (Order of Christian Initiation for Adults)?

I attended Anglican church services in the UK and various other church services in other countries, but I have never taken communion at another church. I'm looking to attend a Catholic Church in the states now, but I feel I should ensure that I have all the necessary documentation first.
Explain your situation to your priest, they may be able to get your baptismal record from your original home parish or just excercise his prudential judgement and allow you to receive communion. 

This is pastoral advice, which isn't the norm for this site, but it may be good to confess attending worship services with other Christians, you'll usually see that mentioned in guides to examinations of conscience (don't want to offend my Protestant friends here, but it is an occasion of sin for Catholics to participate in your services). 

Beyond that, there is no such thing as re-baptism (even for those validly ordained in other Christian sects )


  1246 "Every person not yet baptized and only such a person is able to be baptized." CCC 1246


So, that bit of doctrine probably justifies this question.  If you know you were Baptized the Church's ministers will probably give you the benefit of the doubt.