Objective: The objective of this review is to evaluate the impact of electronic health (eHealth) interventions on physical activity and weight changes among pregnant and/or postpartum populations and to describe the sociodemographic characteristics of the study populations. Introduction: The American College of Obstetricians and Gynecologists recommends 20 minutes of daily physical activity during pregnancy and postpartum. Few pregnant women are physically active and among those who are, physical activity levels decline as pregnancy progresses and during postpartum. Behavioral eHealth interventions offer convenient and frequent accessibility at low cost and high reach. A search of the extant literature including PROSPERO, MEDLINE (PubMed), the Cochrane Database of Systematic Reviews and the JBI Database of Systematic Reviews and Implementation Reports revealed no published or in-progress reviews examining eHealth physical activity interventions among pregnant and/or postpartum populations. Inclusion criteria: Studies of eHealth interventions including pregnant and/or within one-year postpartum populations will be included. Methods: This review will be conducted in accordance with JBI methodology for systematic reviews of effectiveness. The search strategy will aim to locate studies from the inception of each database. Citations will be collated, and duplicates removed. Titles and abstracts will be screened for eligibility against the inclusion criteria and relevant studies retrieved. Included studies will be appraised for methodological quality using JBI standardized critical appraisal instruments. Extracted data will include study methods, intervention design and outcomes (physical activity, weight, participant sociodemographic characteristics). The Grading of Recommendations, Assessment, Development and Evaluation approach for grading the certainty of evidence will be followed. Systematic review registration number: PROSPERO CRD42020124611.