Melvin River

{{Use American English|date=February 2025}}

{{Infobox river

| name = Melvin River

| name_native =

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| pushpin_map = New Hampshire#USA

| pushpin_map_size = 250 px

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| subdivision_type1 = Country

| subdivision_name1 = United States

| subdivision_type2 = State

| subdivision_name2 = New Hampshire

| subdivision_type3 = County

| subdivision_name3 = Carroll

| subdivision_type4 = Town

| subdivision_name4 = Tuftonboro

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| length = {{convert|8.1|mi|km|abbr=on}}

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| source1 = Melvin Pond

| source1_location = Tuftonboro

| source1_coordinates= {{coord|43|42|34|N|71|12|57|W|type:river|display=inline}}

| source1_elevation = {{convert|750|ft|m|abbr=on}}

| mouth = Lake Winnipesaukee

| mouth_location = Melvin Village

| mouth_coordinates = {{coord|43|41|15|N|71|18|19|W|type:river|display=inline,title}}

| mouth_elevation = {{convert|504|ft|m|abbr=on}}

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The Melvin River is an {{convert|8.1|mi|km|adj=mid|-long}}[http://www.granit.unh.edu New Hampshire GRANIT state geographic information system] river in the Lakes Region of central New Hampshire in the United States. It is a tributary of Lake Winnipesaukee, part of the Merrimack River watershed.

The Melvin River lies entirely within the town of Tuftonboro. It begins at the outlet of Melvin Pond, near the town's eastern border, and flows west along the base of the Ossipee Mountains to the north. The river reaches Lake Winnipesaukee at Melvin Village.