I was a first aider at my office in London, and would like to include that on my resume here in the states, but I'm pretty sure it's not called a first aider here. Does anyone know what it would be called?

You might get away with Safety Officer.

I've heard the term first responder! Not sure if that's nationwide or just in California

That describes an EMT, cop or firefighter.

The first one to "respond" to a 911 call.

Elastoplast monitor? What exactly did you do as a "first aider"? We don't have any "first aiders" in our institution so I haven't a clue what it is other than something to do with first aid. Were you responsible, for example, for administering an AED or administering CPR if needed?

You could try saying that you were a member of your company's "Emergency Response Team" (ERT) - that should make sense to most US employers.

Look under jobs medical/dental category on craigslist, there is a term I've seen it listed in there several times but I cant remember what it is, although I worked out it was first aider.

You can do CPR/first aid here and for many jobs it's a requirement, usually they ask for someone who is first aid certified, not a first aider.
So if you are filling out your application and want to say your a first aider, just say first aid certified.
It's also renewable every two years. So if yours is from over than long you'd need to re do it here.

Technically known as Basic Life Support. You can term yourself a Basic Life Support Provider, but I would suggest you take the BLS course through your local hospital or EMS. It's not hard and it's very useful to have. I have both BLS and ACLS (Advanced Cardiac Life Support) but I'm a nurse so you don't really need the ACLS. Go to the American Heart Association website for more details.

Not an AED, as we didn't have them, but CPR yes. In my year as a first aider I responded to a diabetic in distress and a student having a panic attack in an exam. I was trained on CPR and first aid such as to be given to someone who suffers an injury or has a fall, and was trained on recognizing stroke, heart attack, heat-related problems etc.

Basically I was the one with a first aid kit who anyone on my floor was able to contact if they or someone else were in medical distress. Part of my job was to alert security if something more than a plaster were required, and they would call paramedics to my/the victim's location.

I would use a general term like 'First Aid Officer' or 'First Aid Responder' or something like that. I would shy away from terms that require a level of certification here in the US, eventhough you have had the same training in the UK, until you are able to pass the tests and get certified in whatever state you are going to be living in (which shouldn't be tough).

p.s. no one calls them plasters over here. "Band-aid" is the general term of art. "Magic ouchy tape" if dealing with a kid (just made that up).

id eat my hat if you didnt have a first aider in the Uni. people volunteer to do the training in most workplaces and some get an 'allowance' for extra skills. They are who are called if anyone on site has an accident - (*unless its blindingly obviously a 999 call). The first aiders usually have to check all the first aid boxes are kept full of supplies etc. Their names are usually posted on the health and safety noticeboards and the receptionists will know thier names. Its separate to the Health and safety officers.

Law suit fodder should work well.

In my last job here I had to do "Standard First Aid and CPR" 2 different certificates lots of job seem to focus on the CPR more than the first aid

Well, our PE equipment monitor (or officer, whatever posher term is used these days) keeps the First Aid kit in her office, but as far as I know, wouldn't know how to do much more than put on a Band-Aid and call security to call the emergency services (yes, we really do have a two-step process for calling emergency services in an "emergency"). She definitely isn't called a "first-aider", which is why I was asking for further information. If I were her (our "person with the first aid kit in her office"), I certainly wouldn't put anything on my resume. That would be like me putting "print manager" on my resume because I have a printer in my office, or "catering officer" becaused I have a kettle and fridge in my office.

I think on our campus we have certain people among our security personnel who are trained in first aid, but I don't know if they have CPR training.