The present invention provides monoclonal antibodies for human TrkB. In certain embodiments the inventive antibodies bind and activate human TrkB. In certain embodiments the inventive antibodies are selective for human TrkB in that they do not bind (or activate) human TrkA or human TrkC. In some embodiments the inventive monoclonal antibodies cross-react with murine TrkB. Humanized or veneered versions of the inventive antibodies are also encompassed. Pharmaceutical compositions that comprise inventive antibodies are provided as are methods for preparing the inventive antibodies and methods of using these for treatment, detection or purification purposes.