diff --git a/changelog.txt b/changelog.txt
index 1ed30ae501..c369705ecf 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -31,6 +31,7 @@ Template for new versions:
 - `gui/export-world-map`: New GUI tool to configure world map exports from the embark selection screen.
 
 ## New Features
+- `gui/unit-info-viewer`: the unit character sheet now shows the viewed unit's current and long-term mood, color-coded by stress level
 
 ## Fixes
 - `bodyswap`: fix "invalid argument count" when the target unit has no nemesis record
diff --git a/docs/gui/unit-info-viewer.rst b/docs/gui/unit-info-viewer.rst
index ed9d29a2b2..05ea9e9516 100644
--- a/docs/gui/unit-info-viewer.rst
+++ b/docs/gui/unit-info-viewer.rst
@@ -27,3 +27,6 @@ panels, color-coded to highlight rust and the highest skill levels:
 - If a skill is rusty, then the level marker is colored light red
 - If a skill is at Legendary level or higher, it is colored light cyan
 - Other skills are colored plain white
+
+It also shows the viewed unit's current and long-term mood at the top of
+their character sheet, color-coded by stress level.
diff --git a/gui/unit-info-viewer.lua b/gui/unit-info-viewer.lua
index db1635a0a6..411e5b6cb3 100644
--- a/gui/unit-info-viewer.lua
+++ b/gui/unit-info-viewer.lua
@@ -4,6 +4,7 @@ local gui = require('gui')
 local widgets = require('gui.widgets')
 
 local skills_progress = reqscript('internal/unit-info-viewer/skills-progress')
+local overall_mood = reqscript('internal/unit-info-viewer/overall-mood')
 
 --------------------------------------------------
 ---------------------- Time ----------------------
@@ -549,6 +550,7 @@ end
 
 OVERLAY_WIDGETS = {
     skillprogress=skills_progress.SkillProgressOverlay,
+    mood=overall_mood.OverallMoodOverlay,
 }
 
 if dfhack_flags.module then
diff --git a/internal/unit-info-viewer/overall-mood.lua b/internal/unit-info-viewer/overall-mood.lua
new file mode 100644
index 0000000000..b71298bf18
--- /dev/null
+++ b/internal/unit-info-viewer/overall-mood.lua
@@ -0,0 +1,132 @@
+--@ module=true
+
+local gui = require('gui')
+local widgets = require('gui.widgets')
+local overlay = require('plugins.overlay')
+
+local view_sheets = df.global.game.main_interface.view_sheets
+
+-- the unit sheet is a right-side panel whose layout shifts with the window
+-- size, so anchor to the "Overview" tab label, which sits on the bottom tab
+-- row and is rendered on every sub-tab of the sheet. the tabs are near the
+-- top of the sheet, so only scan that band
+local function find_overview_tab()
+    local dscreen = dfhack.screen
+    local sw, sh = dscreen.getWindowSize()
+    for y = 4, math.min(sh - 2, 25) do
+        local line = {}
+        for x = sw - 100, sw - 1 do
+            local tile = dscreen.readTile(x, y)
+            line[#line+1] = tile and tile.ch > 0 and tile.ch < 128
+                and string.char(tile.ch) or ' '
+        end
+        local s = table.concat(line):find('Overview')
+        if s then
+            return y, sw - 101 + s
+        end
+    end
+end
+
+-- display names and colors follow the stress categories in spectate and
+-- dwarfmonitor: index 1 is most stressed, 7 is least
+local STRESS_LEVELS = {
+    {name='Miserable',  pen=COLOR_LIGHTRED},
+    {name='Unhappy',    pen=COLOR_RED},
+    {name='Displeased', pen=COLOR_YELLOW},
+    {name='Content',    pen=COLOR_WHITE},
+    {name='Pleased',    pen=COLOR_CYAN},
+    {name='Happy',      pen=COLOR_LIGHTBLUE},
+    {name='Ecstatic',   pen=COLOR_LIGHTGREEN},
+}
+
+local function get_level(unit, stress)
+    if not stress then
+        return STRESS_LEVELS[dfhack.units.getStressCategory(unit) + 1]
+    end
+    return STRESS_LEVELS[dfhack.units.getStressCategoryRaw(stress) + 1]
+end
+
+OverallMoodOverlay = defclass(OverallMoodOverlay, overlay.OverlayWidget)
+OverallMoodOverlay.ATTRS {
+    desc="Show the viewed unit's current and long-term mood on their sheet.",
+    default_pos={x=-96, y=10},
+    default_enabled=true,
+    version=1,
+    viewscreens={
+        'dwarfmode/ViewSheets/UNIT/Overview',
+        'dungeonmode/ViewSheets/UNIT/Overview',
+    },
+    frame={w=27, h=2},
+    -- anchor on the first tick the sheet is open so the widget never flashes
+    -- at the default position; the scan itself is gated by a cheap key check
+    overlay_onupdate_max_freq_seconds=0,
+}
+
+function OverallMoodOverlay:init()
+    self:addviews{
+        widgets.Label{
+            view_id='mood',
+            frame={t=0, l=0},
+            auto_height=false,
+            text='',
+        },
+    }
+end
+
+function OverallMoodOverlay:onRenderBody(dc)
+    local text, key = {}, ''
+    local unit = df.unit.find(view_sheets.active_id)
+    local soul = unit and unit.status.current_soul
+    if soul then
+        local cur = get_level(unit)
+        local longterm = get_level(unit, soul.personality.longterm_stress)
+        key = cur.name .. '|' .. longterm.name
+        text = {
+            {text='Mood: '},
+            {text=cur.name, pen=cur.pen},
+            NEWLINE,
+            {text='Long-term mood: '},
+            {text=longterm.name, pen=longterm.pen},
+        }
+    end
+    -- only rewrite the label when it changes; setText forces a relayout,
+    -- which makes the text flicker every frame
+    if key ~= self.last_text_key then
+        self.last_text_key = key
+        self.subviews.mood:setText(text)
+    end
+    OverallMoodOverlay.super.onRenderBody(self, dc)
+end
+
+function OverallMoodOverlay:overlay_onupdate()
+    -- the overlay framework persists user-set positions in config.pos; if the
+    -- user has repositioned us away from the default, don't fight them
+    local config = overlay.get_state().config[self.name]
+    if config and config.pos and
+            (config.pos.x ~= self.default_pos.x or
+             config.pos.y ~= self.default_pos.y) then
+        return
+    end
+    -- only rescan when the window size or sheet unit changes, and only after a
+    -- successful anchor so a transient miss doesn't stick
+    local _, sh = dfhack.screen.getWindowSize()
+    local scan_key = sh * 100000 + view_sheets.active_id
+    if scan_key == self.scan_key and self.anchored then return end
+    self.scan_key = scan_key
+    local y, x = find_overview_tab()
+    if not y then
+        self.anchored = false
+        return
+    end
+    -- the tab label sits on the lower tab row; put the mood text at the bottom
+    -- of the vital-stats section (just above its divider), aligned with the
+    -- section's left content margin
+    local t = y + 13
+    x = x - 2
+    if self.anchored and self.frame.t == t and self.frame.l == x then return end
+    self.frame.t = t
+    self.frame.r = nil
+    self.frame.l = x
+    self.anchored = true
+    self:updateLayout(gui.ViewRect{rect=gui.get_interface_rect()})
+end
diff --git a/test/overlay/unit-info-viewer-mood.lua b/test/overlay/unit-info-viewer-mood.lua
new file mode 100644
index 0000000000..44603f911f
--- /dev/null
+++ b/test/overlay/unit-info-viewer-mood.lua
@@ -0,0 +1,144 @@
+local gui = require('gui')
+local overlay = require('plugins.overlay')
+
+local view_sheets = df.global.game.main_interface.view_sheets
+
+config = {
+    target = 'unit-info-viewer',
+    mode = 'fortress',
+}
+
+local was_overlay_enabled = overlay.isEnabled()
+
+local function get_widget()
+    overlay.setEnabled(true)
+    overlay.rescan()
+    overlay.overlay_command({'enable', 'gui/unit-info-viewer.mood'})
+    if not overlay.isOverlayEnabled('gui/unit-info-viewer.mood') then
+        qerror('could not enable gui/unit-info-viewer.mood overlay')
+    end
+    return overlay.get_state().db['gui/unit-info-viewer.mood'].widget
+end
+
+local function sheet_is_open()
+    return dfhack.gui.matchFocusString('dwarfmode/ViewSheets/UNIT/Overview',
+        dfhack.gui.getDFViewscreen(true))
+end
+
+local function get_citizen()
+    for _,u in ipairs(df.global.world.units.active) do
+        if dfhack.units.isCitizen(u) and u.status.current_soul then
+            return u
+        end
+    end
+end
+
+local function open_sheet(unit)
+    view_sheets.open = true
+    view_sheets.context = df.view_sheets_context_type.REGULAR_PLAY
+    view_sheets.active_sheet = df.view_sheet_type.UNIT
+    view_sheets.active_id = unit.id
+    view_sheets.active_sub_tab = 0
+    view_sheets.viewing_unid:insert('#', unit.id)
+end
+
+local function close_sheet()
+    view_sheets.open = false
+    view_sheets.active_id = -1
+    view_sheets.active_sheet = df.view_sheet_type.NONE
+    view_sheets.viewing_unid:resize(0)
+end
+
+local function with_unit_sheet(test_fn)
+    local unit = get_citizen()
+    expect.true_(unit ~= nil, 'test fort must have at least one citizen')
+    local was_open = sheet_is_open()
+    local saved = {
+        open = view_sheets.open,
+        context = view_sheets.context,
+        sheet = view_sheets.active_sheet,
+        id = view_sheets.active_id,
+        sub_tab = view_sheets.active_sub_tab,
+    }
+    local saved_unids = {}
+    for i = 0, #view_sheets.viewing_unid - 1 do
+        saved_unids[i] = view_sheets.viewing_unid[i]
+    end
+    dfhack.with_finalize(
+        function()
+            view_sheets.viewing_unid:resize(0)
+            if was_open then
+                view_sheets.open = saved.open
+                view_sheets.context = saved.context
+                view_sheets.active_sheet = saved.sheet
+                view_sheets.active_id = saved.id
+                view_sheets.active_sub_tab = saved.sub_tab
+                for i = 0, #saved_unids - 1 do
+                    view_sheets.viewing_unid:insert('#', saved_unids[i])
+                end
+            else
+                close_sheet()
+            end
+            overlay.setEnabled(was_overlay_enabled)
+        end,
+        function()
+            open_sheet(unit)
+            test_fn(get_widget(), unit)
+        end)
+end
+
+local function label_text(widget)
+    widget:onRenderBody()
+    local parts = {}
+    for _,tok in ipairs(widget.subviews.mood.text) do
+        parts[#parts+1] = type(tok) == 'table' and tok.text or tostring(tok)
+    end
+    return table.concat(parts)
+end
+
+function test.mood_shows_stress_categories()
+    with_unit_sheet(function(widget, unit)
+        local soul = unit.status.current_soul
+        local cur = soul.personality.stress
+        local lt = soul.personality.longterm_stress
+        local text = label_text(widget)
+        expect.true_(text:find('Mood:') ~= nil, 'mood line missing: ' .. text)
+        expect.true_(text:find('Long%-term mood:') ~= nil,
+            'long-term line missing: ' .. text)
+        expect.true_(#text > 0)
+    end)
+end
+
+function test.mood_reflects_stress_change()
+    with_unit_sheet(function(widget, unit)
+        local soul = unit.status.current_soul
+        local saved = soul.personality.stress
+        local function restore()
+            soul.personality.stress = saved
+        end
+        dfhack.with_finalize(restore, function()
+            soul.personality.stress = 100000
+            local text = label_text(widget)
+            expect.true_(text:find('Miserable') ~= nil,
+                'expected Miserable at stress=100000: ' .. text)
+            soul.personality.stress = -150000
+            text = label_text(widget)
+            expect.true_(text:find('Ecstatic') ~= nil,
+                'expected Ecstatic at stress=-150000: ' .. text)
+        end)
+    end)
+end
+
+function test.mood_hides_for_soulless_unit()
+    with_unit_sheet(function(widget, unit)
+        local soul = unit.status.current_soul
+        local saved = unit.status.current_soul
+        dfhack.with_finalize(function()
+                unit.status.current_soul = saved
+            end, function()
+            unit.status.current_soul = nil
+            local text = label_text(widget)
+            expect.eq('', text, 'expected empty text for soul-less unit')
+        end)
+    end)
+end