Gyatso or Gyamtso (Tibetan: རྒྱ་མཚོ, Wylie: rgya mtsho, ZYPY: Gyamco), is a Tibetan personal name meaning "collection of hundred lake". It is also written Rgya-mtsho in Wylie transliteration, Gyaco in Tibetan pinyin, Gyatsho in Tournadre Simplified Phonetic Transcription and Gyatso in THDL Simplified Phonetic Transcription. In the Lhasa dialect, it is pronounced [càtsʰo] or [càmtsʰo]. In accordance with the latter pronunciation, it can also be spelled "Gyamtso" in English.

Notable persons whose names include "Gyatso" include:

• Each Dalai Lama, other than the 1st, has had Gyatso as the second word of his personal name; for instance, the current Dalai Lama is named Tenzin Gyatso. See the list of Dalai Lamas;
• Chödrak Gyatso, the 7th Karmapa;
• Chögyam Trungpa (Chögyam is short for Chögyi Gyamtso), Buddhist teacher;
• Geshe Kelsang Gyatso, the founder of the New Kadampa Tradition (NKT);
• Khenpo Tsültrim Gyamtso, a Karma Kagyu lama;
• Palden Gyatso, a monk who served thirty-three years as a political prisoner
• Desi Sangye Gyatso, 17th century political figure
• Geshe Sherab Gyatso, 20th century Communist politician
• Thubten Gyatso, an Australian Gelug monk.
• Monk Gyatso, a character from the Nickelodeon cartoon Avatar: The Last Airbender.

Other entities with a similar name:

• Gyamco, village in Tibet