HTMS Phutthayotfa Chulalok (FFG-461) (Thai: เรือหลวงพุทธยอดฟ้าจุฬาโลก) is the former USS Truett (FF-1095), Knox-class frigate.

A Phutthayotfa Chulalok-class frigate, she has a sister ship, the HTMS Phutthaloetla Naphalai (FFG 462).

On 22 September 2020, HTMS Phutthayotfa Chulalok is converted into a floating museum at Sattahip Naval Base in Sattahip District.

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