阿凡提（阿拉伯语： أفندي ‎Afandī; 波斯语： آفندی ‎；维吾尔语：ئەپەندى Ependi），是一个尊称的头衔，相当于汉语中的“先生”或是“师傅”。这一头衔被广泛运用在自土耳其至新疆天山的广大地区内，多用于称呼有较高学识的学者或高阶政府官员，如帕夏或贝伊。与一些词汇联合使用也可以有其特定的含义，如“hekim efendi”即是指苏丹的内科主治医师。头衔的所有格形式为“efendim”，即“我的主人”，通常由仆人使用，或在正式场合中使用。

Effendi, Effendy or Efendi (Greek:αφέντης IPA: [aˈfendis]; Ottoman Turkish language: افندي Efendi, Arabic: أفندي Sindhi: 'آفندي 'Afandī; Persian: آفندی ‎‎, Urdu: آفندی ‎) is a title of nobility meaning a Lord or Master.

It is a title of respect or courtesy, equivalent to the English Sir, which was used in the Ottoman Empire. It follows the personal name, when it is used, and is generally given to members of the learned professions and to government officials who have high ranks, such as bey or pasha. It may also indicate a definite office, as hekim efendi, chief physician to the sultan. The possessive form efendim (my master) is used by servants, in formal discourse, when answering the telephone, and can substitute for "excuse me" in some situations (e.g. asking someone to repeat something) .