J is for Japanese Pagoda Tree
- The letter J was the last letter to be added to the English alphabet.
- Jiffy is 1/100th of a second.
- Jamaica is host to over 100 rivers. Some are unexplored and not navigable.
- A jellyfish is 95% water.
- Rio de Janeiro translates to River of January.
- The old English word 'juke' (meaning dancing) lends its name to the juke box.
- Jack and Jill, Jack Sprat, Jack Be Nimble, Jack and the Beanstalk, Little Jack Horner, The House that Jack Built
- The Spanish and Portuguese cultures use the name Jesus, using the pronunciation: heh-SOOS. Other European Catholic countries do not.
- A female ferret is called a "jill."
- A baby kangaroo is a "joey."
- Jay Leno
- Juneau is the capital of Alaska, named after Joe Juneau, a gold prospector.
- Judas, betrayer of Jesus.
- Jiminy Cricket, the talking, singing, and fancy-looking cricket who advises Pinocchio's conscience. Also a term used to swear without swearing.
- James Cash Penney began his career in retail when he opened the Golden Rule Store in 1902 in Wyoming. Sam Walton worked at a J. C. Penney store in Des Moines, Iowa, back in 1940, and later went on to found Wal-Mart in 1964.
- J. P. Morgan, financial services firm
- Jellies, jams and Junior Mints
- Jerusalem, Jericho, Jordan, Jacob, Jeremiah, Jesse, Jonah
- Patience of Job
- The name Jeep came from the abbreviation used in the army for the "General Purpose" vehicle, G.P.
- Jellystone campgrounds
- Jonquil, jasmine, jade, juniper,
-
The first letters of the months July, August, September and October, and November spell JASON
- Johnny-jump-up, with 12 letters, can be typed using only those letters normally typed with the right hand.
- Japanese Good-bye: Sayonara (SI-O-NA-RA)
