Is it “looking forward to hear from you” or “to hearing from you”?

Looking forward to hear from you” is incorrect because the phrasal verb “look forward to” requires a direct object, i.e., what you’re looking forward to. The direct object must be a noun phrase, and therefore the gerund “hearing” is needed rather than the verb “hear.”

  • I’m looking forward to hear from you.
  • I’m looking forward to hearing from you.