East Slavs

• Russians
• Ukrainians
• Rusyns
• Belarusians

West Slavs

• Lechitic group
  • Poles
  • Silesians 
  • Pomeranians
  • Polabians 
• Czech-Slovak group
• Sorbs (Serbo-Lusatians)

South Slavs

• South-Eastern (Bulgaro-Macedonian) group
  • Bulgarians
    • Pomaks (Muslim Bulgarians)
    • Palćene (Banat Bulgarians)
    • Bessarabian Bulgarians
  • Macedonians
    • Torbesh (Muslim Macedonians)
• South-Western group
  • Serbs
  • Croats
    • Janjevci
    • Molise Croats
    • Burgenland Croats
  • Šokci 
  • Bunjevci 
  • Slovenians
    • Karantanians
  • Bosniaks
  • Montenegrins
  • Muslims by nationality
  • Yugoslavs
  • Goranci
  • Krashovans

1. 

• Russians
• Ukrainians
• Rusyns
• Belarusians
• Serbs
• Bulgarians
• Macedonians
• Montenegrins

2.

• Poles
• Silesians
• Kashubians
• Czechs
• Moravians
• Slovaks
• Pannonian Rusyns
• Slovenes
• Croats
• Bunjevci
• Šokci
• Krashovans

3. Muslim:

• Bosniaks
• Gorani
• Pomaks (Muslim Bulgarians)
• Torbesh (Muslim Macedonians)
• Muslims by nationality

4. Those who are a religious mixture:

• Sorbs (Catholic/Protestant)