I Know You may refer to:

• "I Know You" (Skylar Grey song), a 2015 song
• "I Know You" (Craig David song), a 2017 song
• "I Know You", a 1997 song by Jann Arden from the album Happy?

• Karen Mack (athlete)
• Karen MacLeod
• Karen Macleod
• Karen Madoyan
• Karen Mahlab
• Karen Malpede
• Karen Margaret McPherson
• Karen Margrethe Nielsen
• Karen Marie Aagaard Ørsted
• Karen Marie Aagaard Ørsted Andersen
• Karen-Marie Flagstad
• Karen Marie Toft Jensen
• Karen Marisa Gorham
• Karen Marsh
• Karen Masters
• Karen Mathiak
• Karen McCloskey
• Karen McGrane
• Karen M'Closkey
• Karen McMahon
• Karen McNally
• Karen McRae
• Karen Melchior
• Karen Mellor (swimmer)
• Karen Memory