diff --git a/ansible_mitogen/connection.py b/ansible_mitogen/connection.py
index a715b2b0..4c1df1bd 100644
--- a/ansible_mitogen/connection.py
+++ b/ansible_mitogen/connection.py
@@ -814,7 +814,7 @@ class Connection(ansible.plugins.connection.ConnectionBase):
 
         self.context = dct['context']
         self.chain = CallChain(self, self.context, pipelined=True)
-        if self._play_context.become:
+        if self.become:
             self.login_context = dct['via']
         else:
             self.login_context = self.context
@@ -926,7 +926,7 @@ class Connection(ansible.plugins.connection.ConnectionBase):
         self.close()
 
         inventory_name, stack = self._build_stack()
-        if self._play_context.become:
+        if self.become:
             stack = stack[:-1]
 
         worker_model = ansible_mitogen.process.get_worker_model()
diff --git a/ansible_mitogen/mixins.py b/ansible_mitogen/mixins.py
index 1b6512e8..3953eb52 100644
--- a/ansible_mitogen/mixins.py
+++ b/ansible_mitogen/mixins.py
@@ -294,7 +294,7 @@ class ActionModuleMixin(ansible.plugins.action.ActionBase):
         if not path.startswith('~'):
             # /home/foo -> /home/foo
             return path
-        if sudoable or not self._play_context.become:
+        if sudoable or not self._connection.become:
             if path == '~':
                 # ~ -> /home/dmw
                 return self._connection.homedir
diff --git a/ansible_mitogen/transport_config.py b/ansible_mitogen/transport_config.py
index a9f67209..708c2897 100644
--- a/ansible_mitogen/transport_config.py
+++ b/ansible_mitogen/transport_config.py
@@ -417,6 +417,10 @@ class PlayContextSpec(Spec):
         # used to run interpreter discovery
         self._action = connection._action
 
+    def _become_option(self, name):
+        plugin = self._connection.become
+        return plugin.get_option(name, self._task_vars, self._play_context)
+
     def _connection_option(self, name):
         try:
             return self._connection.get_option(name, hostvars=self._task_vars)
@@ -437,13 +441,13 @@ class PlayContextSpec(Spec):
         return self._connection_option('remote_user')
 
     def become(self):
-        return self._play_context.become
+        return self._connection.become
 
     def become_method(self):
         return self._play_context.become_method
 
     def become_user(self):
-        return self._play_context.become_user
+        return self._become_option('become_user')
 
     def become_pass(self):
         # become_pass is owned/provided by the active become plugin. However
diff --git a/docs/changelog.rst b/docs/changelog.rst
index 1fad75a5..8ab68d97 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -23,6 +23,7 @@ In progress (unreleased)
 
 * :gh:issue:`1159` CI: Reduce number of Jobs by parameterizing Mitogen Docker
   SSH tests
+* :gh:issue:`1083` :mod:`ansible_mitogen`: Support templated become username.
 
 
 v0.3.13 (2024-10-09)
diff --git a/docs/contributors.rst b/docs/contributors.rst
index 69dc1e76..ad35f91c 100644
--- a/docs/contributors.rst
+++ b/docs/contributors.rst
@@ -134,6 +134,7 @@ sponsorship and outstanding future-thinking of its early adopters.
     <li>luto</li>
     <li><a href="https://mayeu.me/">Mayeu a.k.a Matthieu Maury</a></li>
     <li><a href="https://github.com/madsi1m">Michael D'Silva</a></li>
+    <li><a href="https://github.com/mordekasg">mordek</a></li>
     <li><a href="https://twitter.com/nathanhruby">@nathanhruby</a></li>
     <li><a href="https://github.com/opoplawski">Orion Poplawski</a></li>
     <li><a href="https://github.com/philfry">Philippe Kueck</a></li>
diff --git a/tests/ansible/hosts/default.hosts b/tests/ansible/hosts/default.hosts
index bebe90df..ef05803e 100644
--- a/tests/ansible/hosts/default.hosts
+++ b/tests/ansible/hosts/default.hosts
@@ -25,6 +25,20 @@ tt-bare
 [tt_targets_bare:vars]
 ansible_host=localhost
 
+[tt_become_bare]
+tt-become-bare
+
+[tt_become_bare:vars]
+ansible_host=localhost
+ansible_user="{{ lookup('pipe', 'whoami') }}"
+
+[tt_become_by_inv]
+tt-become-user              ansible_become=true ansible_become_user="{{ 'root' | trim }}"
+
+[tt_become_by_inv:vars]
+ansible_host=localhost
+ansible_user="{{ lookup('pipe', 'whoami') }}"
+
 [tt_targets_inventory]
 tt-password                 ansible_password="{{ 'has_sudo_nopw_password' | trim }}" ansible_user=mitogen__has_sudo_nopw
 tt-port                     ansible_password=has_sudo_nopw_password ansible_port="{{ 22 | int }}" ansible_user=mitogen__has_sudo_nopw
diff --git a/tests/ansible/integration/become/all.yml b/tests/ansible/integration/become/all.yml
index c9c331dd..1b507e16 100644
--- a/tests/ansible/integration/become/all.yml
+++ b/tests/ansible/integration/become/all.yml
@@ -5,3 +5,7 @@
 - import_playbook: sudo_nopassword.yml
 - import_playbook: sudo_password.yml
 - import_playbook: sudo_requiretty.yml
+- import_playbook: templated_by_inv.yml
+- import_playbook: templated_by_play_keywords.yml
+- import_playbook: templated_by_play_vars.yml
+- import_playbook: templated_by_task_keywords.yml
diff --git a/tests/ansible/integration/become/templated_by_inv.yml b/tests/ansible/integration/become/templated_by_inv.yml
new file mode 100644
index 00000000..98b68f05
--- /dev/null
+++ b/tests/ansible/integration/become/templated_by_inv.yml
@@ -0,0 +1,14 @@
+- name: integration/become/templated_by_inv.yml
+  hosts: tt_become_by_inv
+  gather_facts: false
+  tasks:
+    - meta: reset_connection
+    - name: Templated become in inventory
+      command:
+        cmd: whoami
+      changed_when: false
+      check_mode: false
+      register: become_templated_by_inv_whoami
+      failed_when:
+        - become_templated_by_inv_whoami is failed
+          or become_templated_by_inv_whoami.stdout != 'root'
diff --git a/tests/ansible/integration/become/templated_by_play_keywords.yml b/tests/ansible/integration/become/templated_by_play_keywords.yml
new file mode 100644
index 00000000..e588c18f
--- /dev/null
+++ b/tests/ansible/integration/become/templated_by_play_keywords.yml
@@ -0,0 +1,16 @@
+- name: integration/become/templated_by_play_keywords.yml
+  hosts: tt_become_bare
+  gather_facts: false
+  become: true
+  become_user: "{{ 'root' | trim }}"
+  tasks:
+    - meta: reset_connection
+    - name: Templated become by play keywords
+      command:
+        cmd: whoami
+      changed_when: false
+      check_mode: false
+      register: become_templated_by_play_keywords_whoami
+      failed_when:
+        - become_templated_by_play_keywords_whoami is failed
+          or become_templated_by_play_keywords_whoami.stdout != 'root'
diff --git a/tests/ansible/integration/become/templated_by_play_vars.yml b/tests/ansible/integration/become/templated_by_play_vars.yml
new file mode 100644
index 00000000..5618f7cc
--- /dev/null
+++ b/tests/ansible/integration/become/templated_by_play_vars.yml
@@ -0,0 +1,16 @@
+- name: integration/become/templated_by_play_vars.yml
+  hosts: tt_become_bare
+  gather_facts: false
+  vars:
+    ansible_become: true
+    ansible_become_user: "{{ 'root' | trim }}"
+  tasks:
+    - name: Templated become by play vars
+      command:
+        cmd: whoami
+      changed_when: false
+      check_mode: false
+      register: become_templated_by_play_vars_whoami
+      failed_when:
+        - become_templated_by_play_vars_whoami is failed
+          or become_templated_by_play_vars_whoami.stdout != 'root'
diff --git a/tests/ansible/integration/become/templated_by_task_keywords.yml b/tests/ansible/integration/become/templated_by_task_keywords.yml
new file mode 100644
index 00000000..52fda111
--- /dev/null
+++ b/tests/ansible/integration/become/templated_by_task_keywords.yml
@@ -0,0 +1,27 @@
+- name: integration/become/templated_by_task_keywords.yml
+  hosts: tt_become_bare
+  gather_facts: false
+  # FIXME Resetting the connection shouldn't require credentials
+  #       https://github.com/mitogen-hq/mitogen/issues/1132
+  become: true
+  become_user: "{{ 'root' | trim }}"
+  tasks:
+    - name: Reset connection to target that will be delegate_to
+      meta: reset_connection
+
+- name: Test connection template by task keywords, with delegate_to
+  hosts: test-targets[0]
+  gather_facts: false
+  tasks:
+    - name: Templated become by task keywords, with delegate_to
+      become: true
+      become_user: "{{ 'root' | trim }}"
+      delegate_to: "{{ groups.tt_become_bare[0] }}"
+      command:
+        cmd: whoami
+      changed_when: false
+      check_mode: false
+      register: become_templated_by_task_with_delegate_to_whoami
+      failed_when:
+        - become_templated_by_task_with_delegate_to_whoami is failed
+          or become_templated_by_task_with_delegate_to_whoami.stdout != 'root'
diff --git a/tests/ansible/templates/test-targets.j2 b/tests/ansible/templates/test-targets.j2
index 0fdef20b..47f2ccd4 100644
--- a/tests/ansible/templates/test-targets.j2
+++ b/tests/ansible/templates/test-targets.j2
@@ -48,6 +48,26 @@ ansible_host={{ tt.hostname }}
 ansible_port={{ tt.port }}
 ansible_python_interpreter={{ tt.python_path }}
 
+[tt_become_bare]
+tt-become-bare
+
+[tt_become_bare:vars]
+ansible_host={{ tt.hostname }}
+ansible_password=has_sudo_nopw_password
+ansible_port={{ tt.port }}
+ansible_python_interpreter={{ tt.python_path }}
+ansible_user=mitogen__has_sudo_nopw
+
+[tt_become_by_inv]
+tt-become-user              ansible_become=true ansible_become_user="{{ '{{' }} 'root' | trim {{ '}}' }}"
+
+[tt_become_by_inv:vars]
+ansible_host={{ tt.hostname }}
+ansible_password=has_sudo_nopw_password
+ansible_port={{ tt.port }}
+ansible_python_interpreter={{ tt.python_path }}
+ansible_user=mitogen__has_sudo_nopw
+
 [tt_targets_inventory]
 tt-password                 ansible_password="{{ '{{' }} 'has_sudo_nopw_password' | trim {{ '}}' }}"  ansible_port={{ tt.port }} ansible_user=mitogen__has_sudo_nopw
 tt-port                     ansible_password=has_sudo_nopw_password  ansible_port="{{ '{{' }} {{ tt.port }} | int {{ '}}' }}"  ansible_user=mitogen__has_sudo_nopw