This chapter covers migration and resettlement effects. Unintended migration and resettlement effects occur when an external intervention creates a movement of population, either towards or away from the intervention, which is different from the objective of the intervention. These movements can be either voluntary or involuntary. This chapter covers three effects: aid-induced resettlement, migratory push effects, and migratory pull effects. Aid-induced resettlement occurs when externally funded projects need land which people currently occupy, thus requiring their voluntary or involuntary resettlement. Migratory push effects occur when successful aid projects relax the budget constraint for beneficiaries, or their direct family, providing them the means to migrate. Migratory pull effects occur when the external intervention incentivizes people in surrounding regions to migrate or temporarily move to the site of the aid intervention.