Is it led by or lead by?

It can be led by or lead by.

It is led by in passive sentences where it means “managed by” (e.g., “This project was led by Helen, our head of Marketing”).

It is lead by in the phrase “lead by example” (when used in the present tense), which means setting an example for the people you are managing by behaving the way you would like them to behave, (e.g., “If you want your team to be honest with you, you need to lead by example by being honest with them”).

QuillBot’s free Grammar Checker will help you to avoid mistakes with tricky irregular verbs like “lead.”