Ji Young "Pearl" Sinn-Bonanni (born July 17, 1967) is a Korean-American professional golfer who played on the LPGA Tour. She played under her maiden name, Pearl Sinn until her marriage in 2002.

Sinn was born in Seoul, South Korea. Her family moved to the United States when she was 9 and she became a U.S. citizen at age 14, renouncing her Korean citizenship.

Sinn had a very successful amateur career. She played college golf at Arizona State University where she was a three-time All-American. She won the U.S. Women's Amateur Public Links in 1988 and 1989 (after finishing runner-up in 1987) and the U.S. Women's Amateur in 1988. Sinn also played on the winning U.S. teams in the 1988 Curtis Cup and 1988 Espirito Santo Trophy.

Sinn turned professional in 1989 and played on the Futures Tour and Ladies European Tour where she was Rookie of the Year in 1990.

Sinn played on the LPGA Tour from 1991 to 2005, winning once in 1998.

Sinn-Bonanni is currently head coach of the women's golf team at Cal State Fullerton.