diff --git a/mercurial/obsutil.py b/mercurial/obsutil.py
--- a/mercurial/obsutil.py
+++ b/mercurial/obsutil.py
@@ -601,3 +601,11 @@ def successorsetverb(successorset):
     else:
         verb = 'split'
     return verb
+
+def markersusers(markers):
+    """ Returns a sorted list of markers users without duplicates
+    """
+    markersmeta = [dict(m[3]) for m in markers]
+    users = set(meta.get('user') for meta in markersmeta if meta.get('user'))
+
+    return sorted(users)
diff --git a/mercurial/templater.py b/mercurial/templater.py
--- a/mercurial/templater.py
+++ b/mercurial/templater.py
@@ -850,6 +850,24 @@ def mod(context, mapping, args):
     func = lambda a, b: a % b
     return runarithmetic(context, mapping, (func, args[0], args[1]))
 
+@templatefunc('obsfateusers(markers)')
+def obsfateusers(context, mapping, args):
+    """Compute obsfate related information based on markers (EXPERIMENTAL)"""
+    if len(args) != 1:
+        # i18n: "obsfateusers" is a keyword
+        raise error.ParseError(_("obsfateusers expects one arguments"))
+
+    markers = evalfuncarg(context, mapping, args[0])
+
+    try:
+        data = obsutil.markersusers(markers)
+        return templatekw.hybridlist(data, name='user')
+    except (TypeError, KeyError, ValueError):
+        # i18n: "obsfateusers" is a keyword
+        msg = _("obsfateusers first argument should be an iterable of "
+                "obsmakers")
+        raise error.ParseError(msg)
+
 @templatefunc('obsfateverb(successors)')
 def obsfateverb(context, mapping, args):
     """Compute obsfate related information based on successors (EXPERIMENTAL)"""
diff --git a/tests/test-obsmarker-template.t b/tests/test-obsmarker-template.t
--- a/tests/test-obsmarker-template.t
+++ b/tests/test-obsmarker-template.t
@@ -14,7 +14,8 @@ Global setup
   > [templates]
   > obsfatesuccessors = " as {join(successors, ", ")}"
   > obsfateverb = "{obsfateverb(successors)}"
-  > obsfate = "{obsfateverb}{obsfatesuccessors}; "
+  > obsfateusers = "{if(obsfateusers(markers), " by {join(obsfateusers(markers), ", ")}")}"
+  > obsfate = "{obsfateverb}{obsfatesuccessors}{obsfateusers}; "
   > [alias]
   > tlog = log -G -T '{node|short}\
   >     {if(predecessors, "\n  Predecessors: {predecessors}")}\
@@ -93,21 +94,21 @@ Predecessors template should show curren
   o  d004c8f274b9
   |
   | @  471f378eab4c
-  |/     Obsfate: rewritten as 4:d004c8f274b9;
+  |/     Obsfate: rewritten as 4:d004c8f274b9 by test1, test2;
   o  ea207398892e
   
   $ hg fatelog
   o  d004c8f274b9
   |
   | @  471f378eab4c
-  |/     Obsfate: rewritten as 4:d004c8f274b9;
+  |/     Obsfate: rewritten as 4:d004c8f274b9 by test1, test2;
   o  ea207398892e
   
   $ hg fatelog -v
   o  d004c8f274b9
   |
   | @  471f378eab4c
-  |/     Obsfate: rewritten as 4:d004c8f274b9;
+  |/     Obsfate: rewritten as 4:d004c8f274b9 by test1, test2;
   o  ea207398892e
   
   $ hg up 'desc(A1)' --hidden
@@ -130,7 +131,7 @@ Predecessors template should show curren
   o  d004c8f274b9
   |
   | @  a468dc9b3633
-  |/     Obsfate: rewritten as 4:d004c8f274b9;
+  |/     Obsfate: rewritten as 4:d004c8f274b9 by test2;
   o  ea207398892e
   
 Predecessors template should show all the predecessors as we force their display
@@ -161,11 +162,11 @@ with --hidden
   o  d004c8f274b9
   |
   | @  a468dc9b3633
-  |/     Obsfate: rewritten as 4:d004c8f274b9;
+  |/     Obsfate: rewritten as 4:d004c8f274b9 by test2;
   | x  f137d23bb3e1
   | |
   | x  471f378eab4c
-  |/     Obsfate: rewritten as 3:a468dc9b3633;
+  |/     Obsfate: rewritten as 3:a468dc9b3633 by test1;
   o  ea207398892e
   
 
@@ -210,14 +211,13 @@ visible.
   @  d004c8f274b9
   |
   | x  a468dc9b3633
-  |/     Obsfate: rewritten as 4:d004c8f274b9;
+  |/     Obsfate: rewritten as 4:d004c8f274b9 by test2;
   | x  f137d23bb3e1
   | |
   | x  471f378eab4c
-  |/     Obsfate: rewritten as 3:a468dc9b3633;
+  |/     Obsfate: rewritten as 3:a468dc9b3633 by test1;
   o  ea207398892e
   
-
   $ hg fatelogjson --hidden
   @  d004c8f274b9
   |
@@ -319,7 +319,7 @@ Predecessors template should show curren
   o  337fec4d2edc
   |
   | @  471597cad322
-  |/     Obsfate: split as 2:337fec4d2edc, 3:f257fde29c7a;
+  |/     Obsfate: split as 2:337fec4d2edc, 3:f257fde29c7a by test;
   o  ea207398892e
   
   $ hg up f257fde29c7a
@@ -360,7 +360,7 @@ with --hidden
   o  337fec4d2edc
   |
   | x  471597cad322
-  |/     Obsfate: split as 2:337fec4d2edc, 3:f257fde29c7a;
+  |/     Obsfate: split as 2:337fec4d2edc, 3:f257fde29c7a by test;
   o  ea207398892e
   
   $ hg fatelogjson --hidden
@@ -461,7 +461,7 @@ Predecessors template should show curren
   o  eb5a0daa2192
   |
   | @  471f378eab4c
-  |/     Obsfate: rewritten as 3:eb5a0daa2192;
+  |/     Obsfate: rewritten as 3:eb5a0daa2192 by test;
   o  ea207398892e
   
   $ hg up 'desc(B0)' --hidden
@@ -490,9 +490,9 @@ displayed
   o  eb5a0daa2192
   |
   | @  0dec01379d3b
-  | |    Obsfate: rewritten as 3:eb5a0daa2192;
+  | |    Obsfate: rewritten as 3:eb5a0daa2192 by test;
   | x  471f378eab4c
-  |/     Obsfate: rewritten as 3:eb5a0daa2192;
+  |/     Obsfate: rewritten as 3:eb5a0daa2192 by test;
   o  ea207398892e
   
   $ hg up 'desc(C0)'
@@ -528,9 +528,9 @@ with --hidden
   @  eb5a0daa2192
   |
   | x  0dec01379d3b
-  | |    Obsfate: rewritten as 3:eb5a0daa2192;
+  | |    Obsfate: rewritten as 3:eb5a0daa2192 by test;
   | x  471f378eab4c
-  |/     Obsfate: rewritten as 3:eb5a0daa2192;
+  |/     Obsfate: rewritten as 3:eb5a0daa2192 by test;
   o  ea207398892e
   
 
@@ -667,7 +667,7 @@ Predecessors template should show curren
   | o  fdf9bde5129a
   |/
   | @  471f378eab4c
-  |/     Obsfate: rewritten as 2:fdf9bde5129a; rewritten as 4:019fadeab383;
+  |/     Obsfate: rewritten as 2:fdf9bde5129a by test; rewritten as 4:019fadeab383 by test;
   o  ea207398892e
   
   $ hg up 'desc(A1)'
@@ -723,11 +723,11 @@ Predecessors template should the predece
   o  019fadeab383
   |
   | x  65b757b745b9
-  |/     Obsfate: rewritten as 4:019fadeab383;
+  |/     Obsfate: rewritten as 4:019fadeab383 by test;
   | @  fdf9bde5129a
   |/
   | x  471f378eab4c
-  |/     Obsfate: rewritten as 2:fdf9bde5129a; rewritten as 3:65b757b745b9;
+  |/     Obsfate: rewritten as 2:fdf9bde5129a by test; rewritten as 3:65b757b745b9 by test;
   o  ea207398892e
   
 
@@ -845,7 +845,7 @@ Predecessors template should show curren
   o  eb5a0daa2192
   |
   | @  471f378eab4c
-  |/     Obsfate: rewritten as 4:eb5a0daa2192;
+  |/     Obsfate: rewritten as 4:eb5a0daa2192 by test;
   o  ea207398892e
   
   $ hg up 'desc(B0)' --hidden
@@ -873,9 +873,9 @@ Predecessors template should both predec
   o  eb5a0daa2192
   |
   | @  0dec01379d3b
-  | |    Obsfate: rewritten as 4:eb5a0daa2192;
+  | |    Obsfate: rewritten as 4:eb5a0daa2192 by test;
   | x  471f378eab4c
-  |/     Obsfate: rewritten as 4:eb5a0daa2192;
+  |/     Obsfate: rewritten as 4:eb5a0daa2192 by test;
   o  ea207398892e
   
   $ hg up 'desc(B1)' --hidden
@@ -903,9 +903,9 @@ Predecessors template should both predec
   o  eb5a0daa2192
   |
   | @  b7ea6d14e664
-  | |    Obsfate: rewritten as 4:eb5a0daa2192;
+  | |    Obsfate: rewritten as 4:eb5a0daa2192 by test;
   | x  471f378eab4c
-  |/     Obsfate: rewritten as 4:eb5a0daa2192;
+  |/     Obsfate: rewritten as 4:eb5a0daa2192 by test;
   o  ea207398892e
   
   $ hg up 'desc(C0)'
@@ -954,11 +954,11 @@ with --hidden
   @  eb5a0daa2192
   |
   | x  b7ea6d14e664
-  | |    Obsfate: rewritten as 4:eb5a0daa2192;
+  | |    Obsfate: rewritten as 4:eb5a0daa2192 by test;
   | | x  0dec01379d3b
-  | |/     Obsfate: rewritten as 3:b7ea6d14e664;
+  | |/     Obsfate: rewritten as 3:b7ea6d14e664 by test;
   | x  471f378eab4c
-  |/     Obsfate: rewritten as 4:eb5a0daa2192;
+  |/     Obsfate: rewritten as 4:eb5a0daa2192 by test;
   o  ea207398892e
   
 
@@ -1082,7 +1082,7 @@ Predecessors template should show curren
   o  7a230b46bf61
   |
   | @  471f378eab4c
-  |/     Obsfate: rewritten as 2:7a230b46bf61;
+  |/     Obsfate: rewritten as 2:7a230b46bf61 by test;
   o  ea207398892e
   
   $ hg up 'desc(A2)'
@@ -1119,7 +1119,7 @@ with --hidden
   @  7a230b46bf61
   |
   | x  471f378eab4c
-  |/     Obsfate: rewritten as 2:7a230b46bf61;
+  |/     Obsfate: rewritten as 2:7a230b46bf61 by test;
   o  ea207398892e
   
 
@@ -1194,9 +1194,9 @@ Check templates
   o  f897c6137566
   |
   | @  0dec01379d3b
-  | |    Obsfate: rewritten as 3:f897c6137566; rewritten as 1:471f378eab4c;
+  | |    Obsfate: rewritten as 3:f897c6137566 by test; rewritten as 1:471f378eab4c by test;
   | x  471f378eab4c
-  |/     Obsfate: rewritten as 2:0dec01379d3b;
+  |/     Obsfate: rewritten as 2:0dec01379d3b by test;
   o  ea207398892e
   
 
@@ -1452,7 +1452,7 @@ Check templates
   | o  ba2ed02b0c9a
   | |
   | x  4a004186e638
-  |/     Obsfate: rewritten as 8:b18bc8331526; rewritten as 9:0b997eb7ceee;
+  |/     Obsfate: rewritten as 8:b18bc8331526 by test; rewritten as 9:0b997eb7ceee by test;
   o  dd800401bd8c
   |
   o  f897c6137566
@@ -1525,17 +1525,17 @@ Check templates
   | o  ba2ed02b0c9a
   | |
   | x  4a004186e638
-  |/     Obsfate: rewritten as 8:b18bc8331526; rewritten as 9:0b997eb7ceee;
+  |/     Obsfate: rewritten as 8:b18bc8331526 by test; rewritten as 9:0b997eb7ceee by test;
   o  dd800401bd8c
   |
   | x  9bd10a0775e4
-  |/     Obsfate: split as 5:dd800401bd8c, 6:4a004186e638, 7:ba2ed02b0c9a;
+  |/     Obsfate: split as 5:dd800401bd8c, 6:4a004186e638, 7:ba2ed02b0c9a by test;
   o  f897c6137566
   |
   | x  0dec01379d3b
-  | |    Obsfate: rewritten as 3:f897c6137566; rewritten as 1:471f378eab4c;
+  | |    Obsfate: rewritten as 3:f897c6137566 by test; rewritten as 1:471f378eab4c by test;
   | x  471f378eab4c
-  |/     Obsfate: rewritten as 2:0dec01379d3b;
+  |/     Obsfate: rewritten as 2:0dec01379d3b by test;
   o  ea207398892e
   
   $ hg fatelogjson --hidden
@@ -1604,7 +1604,7 @@ Check templates
   o  dd800401bd8c
   |
   | @  9bd10a0775e4
-  |/     Obsfate: split as 5:dd800401bd8c, 9:0b997eb7ceee, 10:eceed8f98ffc; split as 5:dd800401bd8c, 8:b18bc8331526, 10:eceed8f98ffc;
+  |/     Obsfate: split as 5:dd800401bd8c, 9:0b997eb7ceee, 10:eceed8f98ffc by test; split as 5:dd800401bd8c, 8:b18bc8331526, 10:eceed8f98ffc by test;
   o  f897c6137566
   |
   o  ea207398892e