Are Orthodox Christians all the same faith? I've noticed some churches in my area that are titled things like:
"Greek" Orthodox
"Russian" Orthodox
"Serbian" Orthodox
"Antiochian" Orthodox etc...

Are these all the same type of Christian Church?
This kinda falls into general reference territory.  There are two major groups of "Orthodox" churches. 

The Eastern Orthodox Church is one large group of churches that share a common theology. It separated from the Catholic Church (or vice versa, depending on your POV) in 1054 AD.


  Thus many Orthodox Churches adopt a national title (e.g. Albanian
  Orthodox, Bulgarian Orthodox, Georgian Orthodox, Greek Orthodox,
  Russian Orthodox, Macedonian Orthodox, Montenegrin Orthodox, Romanian
  Orthodox, Serbian Orthodox, Ukrainian Orthodox etc.) and this title
  serves to distinguish which language, which bishops, and which of the
  typica is followed by that particular congregation. In the Middle
  East, Orthodox Christians have also been often referred as Roman (or
  Rum) Orthodox, because of their historical connection with the Eastern
  Roman (Byzantine) Empire.


They are the "same type" of church in that they share a theology, but they tend to be ethnically tied - if you go into a Greek Orthodox Church in Texas, you'll still need to speak you some Greek. They don't have a pope, but the group of all their bishops are considered to be the ruling body of the church.

The Oriental Orthodox Church split off earlier (451 AD) over the Council of Chalcedon.


  Despite the potentially confusing nomenclature (Oriental meaning
  Eastern), Oriental Orthodox churches are distinct from those that are
  collectively referred to as the Eastern Orthodox Church. The Oriental
  Orthodox communion comprises six groups: Coptic Orthodox, Ethiopian
  Orthodox, Eritrean Orthodox, Syriac Orthodox, Malankara Orthodox
  Syrian Church (India) and Armenian Apostolic churches.2 These six
  churches, while being in communion with one another, are
  hierarchically independent.


This is a pretty small group however; most Orthodox churches you'll see in the West tend to be of the Eastern Orthodox breed.

These churches are all the same faith in the sense that they recognize each other are Christian, but the Eastern and Oriental Orthodox branches are not in communion with each other (or anyone else, I believe) and consider other branches to be schismatic and more-or-less heretical.

There are a lot of churches with similar names and variants. Of course they are mostly synonyms, a trivial canvas of local denomination names and sub-denominations indicates you have to be quite specific. A commenter asked about "the Coptics;" there is a Coptic Catholic Church and a Coptic Orthodox Church, for example.