| Lucy Grant Cannon | |
| Birth Date: | October 22, 1880 |
| Birth Place: | Salt Lake City, Utah Territory, United States |
| Death Place: | Salt Lake City, Utah, United States |
| Resting Place: | Salt Lake City Cemetery |
| Spouse: | George Jenkins Cannon |
| Children: | 7 including George I. Cannon |
| Parents: | Heber J. Grant Lucy Stringham |
| Position Or Quorum1: | 4th general president of the Young Women |
| Called By1: | Heber J. Grant |
| Predecessor1: | Ruth May Fox |
| Successor1: | Bertha S. Reeder |
| Start Date1: | 1937 |
| End Date1: | 1948 |
| Position Or Quorum2: | First Counselor in the general presidency of the Young Women |
| Called By2: | Ruth May Fox |
| Predecessor2: | Ruth May Fox |
| Successor2: | Helen S. Williams |
| Start Date2: | 1929 |
| End Date2: | 1937 |
| Position Or Quorum3: | Second Counselor in the general presidency of the Young Women |
| Called By3: | Martha H. Tingey |
| Predecessor3: | Mae Taylor Nystrom |
| Successor3: | Clarissa A. Beesley |
| Start Date3: | 1923 |
| End Date3: | 1929 |
Lucy Cannon (Grant; October 22, 1880 – May 27, 1966) was the fourth general president of the Young Women organization of the Church of Jesus Christ of Latter-day Saints (LDS Church) from 1937 to 1948. She was a member of the general presidency of the Young Women from 1923 to 1948, serving as a counselor to two presidents.
Lucy Grant was born in Salt Lake City, Utah Territory to Lucy Stringham and LDS Church apostle Heber J. Grant. She served as a church missionary in the Western States Mission of the church in 1901. In 1902, Grant married George J. Cannon.
In 1923, Cannon was asked to succeed Mae Taylor Nystrom as the second counselor to Martha Horne Tingey, the general president of what was then called the Young Ladies' Mutual Improvement Association. In 1929, when Ruth May Fox succeeded Tingey, Cannon was asked to be her first counselor. Cannon served in this capacity until 1929, when Fox was released and Cannon was selected by her father, who was President of the Church, to be the fourth general president of what had been renamed the Young Women's Mutual Improvement Association. Cannon served until 1948, when she was succeeded by Bertha Stone Reeder.
Cannon and her husband were the parents of seven children. Their son George I. Cannon was a general authority of the church from 1986 to 1991. Lucy Grant Cannon died in Salt Lake City.