Guitar Junior may refer to:

• Luther "Guitar Junior" Johnson (born 1939), blues singer and guitarist
• Lonnie Brooks (1933–2017), blues singer and guitarist

• Watermelon beetle
• Watermelon challenge
• Watermelon in Easter Hay
• Watermelon Peak
• Watermelon Records
• Watermelon seed
• Watermelon spoiling on the vine
• Watermelon Steven
• Watermelon tree
• Watermen's Company
• Watermen's Museum
• Watermen's Stairs
• Watermen’s Museum
• Water Meter Room
• Watermeyer, Stefan
• Watermilfoil leafcutter moth
• Water Mill (disambiguation)
• Water (Miller & Atkins song)
• Water Mill (LIRR station)
• Watermills on Zala River
• Watermill station
• Water Mill station (LIRR)
• Watermill station (LIRR)
• Waterminder
• Water moccasins