Marshwood High School

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

{{Infobox school

| name = Marshwood High School

| image =

| image_size =

| streetaddress = 260 Dow Highway

| city = South Berwick, Maine

| zipcode = 03908

| country = United States

| coordinates = {{coord|43.2007|-70.7972 |format=dms |region:US-ME_type:edu |display=inline,title}}

| oversight = MSAD 35

| superintendent = John Caverly

| principal = Brett Hoogterp

| type = Public high school

| grades = 9–12

| communities = Eliot
South Berwick
Rollinsford

| accreditation = New England Association of Schools and Colleges

| feeder_schools = Marshwood Middle School

| campus_size = Small

| campus_type = Suburban

| mascot = Hawk

| team_name = Hawks

| colors = {{Color box|#2A155D|border=darkgray}} Purple and {{Color box|white|border=darkgray}} White

| yearbook = The Reed

| newspaper = The Marshwood Times

| established =

| founded = 1966

| ratio = 13.12

| teaching_staff = 51.00 (FTE)

| enrollment = 669 (2023-2024){{cite web|url=https://nces.ed.gov/ccd/schoolsearch/school_detail.asp?Search=1&DistrictID=2311370&ID=231137000491|title=Marshwood High School|publisher=National Center for Education Statistics|accessdate=April 11, 2025}}

| homepage = {{URL|http://www.rsu35.org/mhs/}}

}}

Marshwood High School is a public high school in York County, Maine, United States. It serves the towns of Eliot and South Berwick, as well as Rollinsford, New Hampshire. It has been at its current location at 260 Dow Highway (Route 236) in South Berwick since September 1999, when it was moved from its previous location in Eliot. The current site is about {{convert|10|mi}} from both Portsmouth, New Hampshire, and Kittery, Maine.

The school's mascot is the Hawk.

The school offers a variety of varsity athletics.