Lichess recognizes all FIDE titles gained from OTB (over the board) play, as well as many national master titles. Here is a list of FIDE titles:

• Grandmaster (GM)
• International Master (IM)
• FIDE Master (FM)
• Candidate Master (CM)
• Woman Grandmaster (WGM)
• Woman International Master (WIM)
• Woman FIDE Master (WFM)
• Woman Candidate Master (WCM)

If you have an OTB title, you can apply to have this displayed on your account by completing the verification form, including a clear image of an identifying document/card and a selfie of you holding the document/card.

Verifying as a titled player on Lichess gives access to play in the Titled Arena events.

Finally there is an honorary Lichess master (LM) title.