This Darkened Heart

{{Use mdy dates|date=December 2020}}

{{Infobox album

| name = This Darkened Heart

| type = studio

| artist = All That Remains

| cover = Darkenedheart.jpg

| alt =

| released = March 23, 2004

| recorded = October 1–22, 2003

| venue =

| studio = Zing Studios in Westfield, MA

| genre =

• Melodic death metal{{cite web |url=https://wknc.org/2021/02/28/album-of-the-week-all-that-remains-this-darkened-heart-2004/ |website=WKNC 88.1 |title=Album of the Week: All That Remains - This Darkened Heart (2004) |access-date=16 August 2021}}
• metalcore

| length = 41:33

| label = Prosthetic

| producer = Adam Dutkiewicz

| prev_title = Behind Silence and Solitude

| prev_year = 2002

| next_title = The Fall of Ideals

| next_year = 2006

| misc = {{Singles

| name = This Darkened Heart

| type = studio

| single1 = This Darkened Heart

| single1date = March 6, 2004{{cite web|publisher=Encyclopaedia Metallum|url=https://www.metal-archives.com/albums/All_That_Remains/This_Darkened_Heart/426441|title=All That Remains - This Darkened Heart}}

| single2 = Tattered on My Sleeve

| single2date = October 31, 2004{{cite web|publisher=Encyclopaedia Metallum|url=https://www.metal-archives.com/albums/All_That_Remains/Tattered_on_My_Sleeve/234436|title=All That Remains - Tattered on My Sleeve}}

| single3 = The Deepest Gray

| single3date = February 20, 2005{{cite web|publisher=Encyclopaedia Metallum|url=https://www.metal-archives.com/albums/All_That_Remains/The_Deepest_Gray/234434|title=All That Remains - The Deepest Gray}}

}}

}}

{{Album ratings

| rev1 = AllMusic

| rev1Score = {{Rating|3|5}}{{cite web|publisher=AllMusic|last=York|first=William|url=https://www.allmusic.com/album/this-darkened-heart-mw0000328599|title=This Darkened Heart - All That Remains}}

| rev2 = Exclaim!

| rev2score = Positive{{cite magazine|magazine=Exclaim!|last=Pratt|first=Greg|url=http://exclaim.ca/music/article/all_that_remains-this_darkened_heart|title=All That Remains This Darkened Heart|date=June 1, 2004|accessdate=May 3, 2019}}

| rev3 = Punk News

| rev3score = {{rating|4.5|5}}{{cite web|publisher=Punk News|url=https://www.punknews.org/review/4455/all-that-remains-this-darkened-heart|title=All That Remains - This Darkened Heart|date=October 2, 2005|accessdate=May 3, 2019}}

| noprose = yes

}}

This Darkened Heart is the second studio album by the American heavy metal band All That Remains, released on March 23, 2004. It includes the singles "This Darkened Heart", "Tattered on My Sleeve" and "The Deepest Gray", all three of which had music videos created for them. The album was produced by Killswitch Engage guitarist Adam Dutkiewicz, who previously produced the band's debut.

This Darkened Heart is the first All That Remains album to feature current rhythm guitarist Mike Martin, the last album to feature drummer Michael Bartlett, and the first album to feature bassist Matt Deis who left the band in 2005 and then rejoined in 2022.