Abstract: A T-post extension is disclosed for extending the effective length of an existing T-post to increase the height of a fence. The T-post extension has a plurality of engagement members that slidably engage a top portion of a T-post at opposing surfaces of the T-post to provide steadfast coupling of the T-post extension with the existing T-post. The T-post extension includes a body section generally matching the cross section of the T-post and a plurality of tines extending outward from an end of the body section. The tines are configured to slide over and engage an end of the T-post to extend the length of the T-post. The tines may be configured to engage one or more internal corners of the T-post so that existing wire running at the top of the T-post is uninterrupted.