Guide: How to Say “Sir” in Thailand

Greetings and interactions in Thailand hold significant cultural importance. Politeness is highly valued, and knowing how to address someone respectfully can create a positive impression. When it comes to addressing a person as “sir” in Thailand, it is essential to understand both the formal and informal ways to convey respect. This guide will provide you with various tips, examples, and regional variations.

Formal Ways to Say “Sir”

Thailand has an intricate system of honorifics to acknowledge age, social status, and hierarchies. When addressing someone formally, you can use the term “คุณ” (khun) before their first name or title. While “คุณ” (khun) is commonly translated as “Mr.” or “Mrs.” in English, it is more versatile and applicable to both genders. Here are some examples:


  • คุณสมชาย (khun Somchai) – Sir Somchai
  • คุณอรุณ (khun Aroon) – Sir Aroon

In formal settings, you can also use the term “ท่าน” (than). This term indicates a higher level of respect and is typically used when addressing someone of significantly higher status or authority. Examples of using “ท่าน” (than) can include:


  • ท่านรองนายกรัฐมนตรี (than Rong-na-yai Krat-tha-mon-tri) – Deputy Prime Minister Sir
  • ท่านศาสตราจารย์ (than Saat-sa-sa-rach) – Professor Sir

Informal Ways to Say “Sir”

In more casual or everyday situations, it’s common to use an informal approach when addressing someone as “sir.” The most frequently used term is “พี่” (phee) meaning “older sibling” or “brother/sister.” It conveys friendliness, respect, and creates a comfortable environment. Here are some examples:


  • พี่วิทยา (phee Wi-tha-ya) – Brother Sir
  • พี่น้ำ (phee Nam) – Brother Sir

Note that using “พี่” (phee) can be respectful regardless of the person’s actual age. It is a way to show politeness, especially for people of the same status or in a more casual setting.

Regional Variations

While formal and informal terms are widely used throughout Thailand, there are minor regional variations worth mentioning. In the southern region of Thailand, people often use “หนู” (nu) instead of “คุณ” (khun) in informal situations. This term is similar to addressing someone as “buddy” or “pal” in English. However, it should be used with caution and only when you’re familiar with the person.


  • หนูเอ๋ย (nu oi) – Buddy Sir
  • หนูบอบ (nu Borp) – Pal Sir

Tip: When unsure about the appropriate term to use, it is best to err on the side of formality until the other person indicates otherwise. Thai people are generally understanding and appreciate the effort to respect their culture.


In summary, addressing someone as “sir” in Thailand can be done through formal or informal means. In formal scenarios, using “คุณ” (khun) or “ท่าน” (than) before a person’s name or title conveys respect. In more casual situations, “พี่” (phee) meaning “older sibling” is a commonly used term to denote a respectful and friendly tone. Remember to adapt your language based on the context and be sensitive to regional variations, such as “หนู” (nu) in the southern region. By showing respect through appropriate language, you can create positive interactions and leave a lasting impression in Thai culture.

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