Kathryn Elizabeth "Katie" Douglas (born May 7, 1979) is a retired American professional basketball player. Her primary position is shooting guard, her secondary is small forward. She is known league-wide for her long-range shooting ability. Born in Indianapolis, Indiana, Douglas is left-handed.

In the WNBA, she has been a multiple time WNBA All-Star and has been a selection to both the All-WNBA Team and WNBA All-Defensive First Team. She won WNBA Championship with the Indiana Fever in 2012.

After attending Perry Meridian High School in Indianapolis, Douglas attended Purdue University and graduated in 2001 as a communications major. She helped lead Purdue to a NCAA Women's Division I Basketball Championship in 1999 and was a two-time Kodak All-America in 2000 and 2001, as well as being named to the 1999 and 2001 NCAA Women's Final Four All-Tournament Team. She shared Big Ten Conference Player of the Year honors in 2000 with Helen Darling, and in 2001 was the unanimous Big Ten Player of the Year and winner of the Silver Basketball from the Chicago Tribune. Douglas also received the 2001 Big Ten Conference Suzy Favor Award, which is given to the conference's female athlete of the year across all sports. Douglas played at Purdue for head coach Carolyn Peck.

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