E33 may refer to:

• Nimzo-Indian Defense, Encyclopaedia of Chess Openings code
• HMS E33
• European route E33
• GE E33
• Duta–Ulu Klang Expressway, route E33 in Malaysia

• Adult at 14 Season
• Adult at 14 season
• Adult Baby Syndrome
• Adult Baby syndrome
• Adult baby syndrome
• Adult blog
• Adult Blood Lead Epidemiology and Surveillance
• Adult Blood Lead Epidemiology and Surveillance (ABLES)
• Adult brownie
• Adult brownies
• Adult cake
• Adult cakes
• Adult Care
• Adult Care Food
• Adult cartoon
• Adultcentricism
• Adultcentrism
• Adult Channel
• Adult channels
• Adult CHR
• Adult cinema
• Adult circumcision
• Adult computer and video games
• Adult Contemporary (Billboard chart)
• Adult Contemporary (Billboard Chart)