A Long-Term Registry of Humira® (Adalimumab) in Subjects With Moderately to Severely Active Crohn's Disease (CD)

* Subjects who are newly prescribed HUMIRA® (adalimumab) therapy (have never been treated with adalimumab) or who are participants in Abbvie sponsored investigational Crohn's disease (CD) trials, are currently receiving adalimumab and for whom the treating physician has made the decision to continue with adalimumab therapy beyond the duration of the investigational trial. * Subjects who were participants in AbbVie sponsored investigational Crohn's CD trials, who have not had dose interruptions since the last dose of study drug, where the Investigator can provide source documentation of dosing information. * Subjects who are currently receiving adalimumab, as per the local approved label, who have not had dose interruptions since the induction dose of adalimumab where the Investigator can provide source documentation of dosing information. * Subjects willing to consent to data being collected and provided to AbbVie. * Subjects capable of and willing to give written informed consent and to comply with the requirements of the Registry study protocol.

\- Subjects should not be enrolled if they cannot be treated in accordance with the local product label.