Itchen Valley is a civil parish in the English county of Hampshire. Forming part of the City of Winchester district, it comprises the villages of Avington, Easton, Itchen Abbas and Martyr Worthy, with a population of 1,267 at the time of the 2001 Census, increasing at the 2011 Census to a population of 1,459. It is to the northeast of Winchester and takes its name from the River Itchen. The parish is crossed by the M3 motorway, and contains Winchester services.