• Kainolophobia - Fear of anything new, novelty
• Kakorrhaphiophobia - Fear of failure or defeat
• Katagelophobia - Fear of ridicule
• Kathisophobia - Fear of sitting down
• Katsaridaphobia - Fear of cockroaches
• Kenophobia - Fear of voids or empty spaces
• Keraunophobia - Fear of thunder and lightning
• Kinemortophobia – Fear of zombies
• Kinetophobia - Fear of movement or motion
• Kleptophobia - Fear of stealing
• Koinoniphobia – Fear of rooms that are full of people
• Kolpophobia - Fear of genitals, particularly female
• Koniophobia - Fear of dust
• Kopophobia - Fear of fatigue
• Kosmikophobia - Fear of space or the cosmos
• Koumpounophobia - Fear of buttons on clothing
• Kymophobia - Fear of waves
• Kynophobia - Fear of rabies
• Kyphophobia - Fear of stooping