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The rank of lieutenant in Eastern Europe, also called poruchnick in Slavic languages,^[a] is one used in Slavophone armed forces. Depending on the country, it is either the lowest or second lowest officer rank.

The rank designation poruchik might be derived from Russian: поpученец (a person tasked by a special mission); Russian: поручение (assignment, commission) or Russian: поручить (task to look after, charge with something). Normally the poruchik received military orders in written form and was responsible to meet the particular goals and objectives anticipated.

The Imperial Russian Army introduced this rank first in middle of the 17th century, by the Strelets so-called New Order Regiments ^{[clarification needed]}, reflected in the Table of Ranks. A poruchik was normally assigned to assistant commanding officer of a company, later platoon. In 1798 this particular rank designation was replaced by lieutenant beginning with the Russian Guards, followed by other military units, and legalised by the Table of Ranks.

• 
  Poručnik
  (Bosnian Ground Forces)^[1]
• 
  Poručnik
  (Croatian Army)^[2]
• 
  Poručík
  (Czech Land Forces)^[3]
• 
  Поручник
  Poručnik
  (Macedonian Ground Forces)^[4]
• 
  Poručnik
  (Montenegrin Ground Army)^[5]
• 
  Porucznik
  (Polish Land Forces)^[6]
• 
  Поручник
  Poručnik
  (Serbian Army)^[7]
• 
  Poručík
  (Slovak Ground Forces)^[8]
• 
  Poročnik
  (Slovenian Ground Force)^[9]

• Podporuchik
• Lieutenant
• Lieutenant colonel (Eastern Europe)
• Colonel (Eastern Europe)
• Lieutenant colonel general
• Comparative army officer ranks of Europe
• Ranks and insignia of the Russian armed forces until 1917