Magalloway River

{{short description|River in Maine and New Hampshire, United States}}

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

{{Infobox river

| name = Magalloway River

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| image = Magalloway River Below Aziscohos Dam in the Mountains of Western Maine.jpg

| image_caption = Magalloway River below Aziscohos Dam in western Maine

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| pushpin_map = Maine#New Hampshire#USA

| pushpin_map_size = 250 px

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| subdivision_type1 = Country

| subdivision_name1 = United States

| subdivision_type2 = States

| subdivision_name2 = Maine, New Hampshire

| subdivision_type3 = Counties

| subdivision_name3 = Oxford, ME, Coos, NH

| subdivision_type4 = Townships

| subdivision_name4 = North Oxford, ME, Lincoln Plantation, ME, Magalloway, ME, Second College Grant, NH, Wentworth Location, NH, Errol, NH

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| length = {{convert|48|mi|km|abbr=on}}

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| source1 = Confluence of West Branch and Third East Branch

| source1_location = North Oxford, ME

| source1_coordinates= {{coord|45|15|26|N|71|1|37|W|type:river|display=inline}}

| source1_elevation = {{convert|1850|ft|m|abbr=on}}

| mouth = Androscoggin River

| mouth_location = Errol, NH

| mouth_coordinates = {{coord|44|47|0|N|71|3|53|W|type:river|display=inline,title}}

| mouth_elevation = {{convert|1245|ft|m|abbr=on}}

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| tributaries_left = Second East Branch, First East Branch, Sturtevant Stream

| tributaries_right = Little Magalloway River, Abbott Brook, Dead Diamond River, Bear Brook

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The Magalloway River is a river in northwestern Maine and northern New Hampshire in the United States. It is a tributary of the Androscoggin River, which flows to the Kennebec River at Merrymeeting Bay in Maine, near the Atlantic Ocean. The total length of the river is {{Convert|30|mi}}, or {{Convert|48|mi}} if the distances across intervening lakes are included.

The Magalloway River rises near the extreme northwestern corner of Maine, at the juncture of the West Branch and the Third East Branch of the Magalloway. The river flows south through logging country to {{Convert|2.5|mi|km|adj=mid|-long}} Parmachenee Lake, then descends for another {{Convert|2.6|mi}} to the {{Convert|15|mi|km|adj=mid|-long}} Aziscohos Lake. Below the lake dam, the Magalloway turns west and descends {{Convert|250|ft}} in {{Convert|2|mi}} to the village of Wilsons Mills, Maine, before once again turning south, now along the New Hampshire–Maine border. The river ends where it joins the outlet of Umbagog Lake, forming the Androscoggin River.

Tributaries of the Magalloway include the West Branch, the First, Second, and Third East Branches, the Little Magalloway River, and the Dead Diamond River. The Magalloway passes through the townships of Parmachenee, Lynchtown, Parkertown, Lincoln, and Magalloway in Maine, and the townships of Second College Grant and Wentworth Location in New Hampshire.

Its name is from some Native American language, meaning "large tail".{{cite book|last=Gannett|first=Henry|title=The Origin of Certain Place Names in the United States|url=https://archive.org/details/bub_gb_9V1IAAAAMAAJ|year=1905|publisher=U.S. Government Printing Office|page=[https://archive.org/details/bub_gb_9V1IAAAAMAAJ/page/n195 196]}}