First, consult your primary physician. He/she will have to take a thorough history if it's the first time you're being seen. Next he'll do an assessment to determine the cause of your complaint. He will then give you a referral to to see a specialist depending on what is causing the problem.

To directly answer your question, depending on the state where you live in, you can directly seek consult from a licensed Physical Therapist and receive services from one. He/she will do an initial assessment and perform several tests to confirm findings then make a diagnosis. Services and treatment will be provided as necessary by the Physical Therapist at a specific duration and may also be depending on how you respond to the treatment. So I would say, a physical therapist would be someone who has adequate knowledge and part of the allied medical personnel who could provide you with services like the one you particulary need.

I am not a doctor or medical professional but I would add that neck pain might be indicative of a more serious medical condition, in which case you might want to consult a physician first. That said, I assume most neck pain people experience is not serious, and usually a result of weakened/tweaked neck muscles due to stress and a lack of exercise in which case all of the other options are probably equally suitable. Personally, if it's not a serious medical condition, I would recommend self treatment like exercise: yoga, weight lifting, stretching, cardio exercise.

Again, the standard disclaimer applies:

I would start with a combination of the first two, massage and chiropractor. Its not all that easy finding a good chiropractor or masseuse, but go with your insurance's top recommendations.

I think a good massage followed by a chiropractic treatment (and maybe a followup or two for whichever helps the most) would be an easy and quick way to resolve whatever is giving you this neck pain.

After that, staying active and exercising regularly tends to keep small aches and pains (in addition to just soreness!) from happening as often.

Following a car accident 17 years ago, I live with neck pain caused by muscle tension. I've tried just about everything possible but have found osteo and massage to be best and of equal value.

DEEP TISSUE massage is, I find, excellent. A good practitioner successfully works through the upper layers of muscle and reaches the underlying muscles that many regular practitioners (and husbands/wives/friends) are unable to get to.

Learning, possibly from the practitioner, some simple stretches will be beneficial because the first few treatments generally give short-term relief. Stretching in your own time will help stop the muscles returning to the tight condition.

Wisdom would dictate, however, that if your pain was brought on by some trauma such as falling over or having some other kind of impact or jolt, seeing you GP and possibly getting X-rays would be the first step.