Mark's and Jack's Island Natural Area Preserve

{{Use mdy dates|date=January 2025}}

{{Infobox protected area

| name = Mark's and Jack's Island Natural Area Preserve

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| map = Virginia#USA

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| map_caption = Location within Virginia

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| location = Accomack County, Virginia

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| coordinates = {{coord|37.8177|-75.7044|region:US-VA|format=dms|display=title,inline}}

| coords_ref = {{cite report |url=http://gicinc.org/PDFs/AC_AssetMaps_122309_Drafts.pdf |title=Blue/Green Infrastructure Study |publisher=Accomack County, Virginia |page=7 |access-date=December 21, 2016}}

| area_acre = 2305

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| owner = The Nature Conservancy

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Mark's and Jack's Island Natural Area Preserve is a {{convert|2305|acre|km2|adj=on}} Natural Area Preserve located in Accomack County, Virginia. The preserve supports Chesapeake Bay beach habitat, as well as various types of marsh, shrub, and forest vegetation. Many species of birds can be found in the preserve's wetlands, and numerous plant species live in the marsh, including marsh-elder. Loblolly pine and black cherry may be seen along the tops of some old dunes. The beaches provide a home for the northeastern beach tiger beetle.{{cite web |title=Mark's & Jack's Island Natural Area Preserve |url=http://www.dcr.virginia.gov/natural-heritage/natural-area-preserves/markjack |access-date=February 18, 2024 |publisher=Virginia Department of Conservation and Recreation}}

The preserve has been designated an Important Bird Area (IBA) by the National Audubon Society as a part of the "Delmarva Bayside Marshes IBA", which also includes the nearby Parkers Marsh Natural Area Preserve and Saxis Wildlife Management Area.{{Cite web|url=http://web4.audubon.org/bird/iba/virginia/Documents/Delmarva%20Bayside%20Marshes.pdf |title=Delmarva Bayside Marshes IBA |publisher=National Audubon Society |access-date=December 25, 2016}}

The preserve is owned and maintained by The Nature Conservancy. Access to the preserve is possible only by boat, and is restricted to educational or research purposes. Visitors must make arrangements with The Nature Conservancy prior to visiting.