diff --git a/include/mstch/mstch.hpp b/include/mstch/mstch.hpp
index 58d3330..de0c05e 100644
--- a/include/mstch/mstch.hpp
+++ b/include/mstch/mstch.hpp
@@ -103,11 +103,13 @@ using object = internal::object_t<node>;
 using lambda = internal::lambda_t<node>;
 using map = std::map<const std::string, node>;
 using array = std::vector<node>;
+using partial_callback = std::function<std::string(std::string partial_name)>;
 
 std::string render(
     const std::string& tmplt,
     const node& root,
     const std::map<std::string,std::string>& partials =
-        std::map<std::string,std::string>());
+        std::map<std::string,std::string>(),
+    partial_callback partial_cb = partial_callback());
 
 }
diff --git a/src/mstch.cpp b/src/mstch.cpp
index 4d84e97..7cc7b9c 100644
--- a/src/mstch.cpp
+++ b/src/mstch.cpp
@@ -7,14 +7,14 @@ using namespace mstch;
 
 std::function<std::string(const std::string&)> mstch::config::escape;
 
-std::string mstch::render(
-    const std::string& tmplt,
+std::string mstch::render(const std::string& tmplt,
     const node& root,
-    const std::map<std::string,std::string>& partials)
+    const std::map<std::string,std::string>& partials,
+    partial_callback partial_cb)
 {
   std::map<std::string, template_type> partial_templates;
   for (auto& partial: partials)
     partial_templates.insert({partial.first, {partial.second}});
 
-  return render_context(root, partial_templates).render(tmplt);
+  return render_context(root, partial_templates, partial_cb).render(tmplt);
 }
diff --git a/src/render_context.cpp b/src/render_context.cpp
index 90b2ffc..35e4504 100644
--- a/src/render_context.cpp
+++ b/src/render_context.cpp
@@ -24,10 +24,9 @@ std::string render_context::push::render(const template_type& templt) {
   return m_context.render(templt);
 }
 
-render_context::render_context(
-    const mstch::node& node,
-    const std::map<std::string, template_type>& partials):
-    m_partials(partials), m_nodes(1, node), m_node_ptrs(1, &node)
+render_context::render_context(const mstch::node& node,
+    const std::map<std::string, template_type>& partials, const partial_callback partial_cb):
+    m_partials(partials), m_nodes(1, node), m_node_ptrs(1, &node), m_partial_cb(partial_cb)
 {
   m_state.push(std::unique_ptr<render_state>(new outside_section));
 }
@@ -67,6 +66,11 @@ std::string render_context::render(
 std::string render_context::render_partial(
     const std::string& partial_name, const std::string& prefix)
 {
-  return m_partials.count(partial_name) ?
-      render(m_partials.at(partial_name), prefix) : "";
+  if(m_partials.count(partial_name)) {
+      return render(m_partials.at(partial_name), prefix);
+  } else if (m_partial_cb) {
+      return render({m_partial_cb(partial_name)}, prefix);
+  } else {
+      return "";
+  }
 }
diff --git a/src/render_context.hpp b/src/render_context.hpp
index b97d41b..a5fb5df 100644
--- a/src/render_context.hpp
+++ b/src/render_context.hpp
@@ -25,7 +25,8 @@ class render_context {
 
   render_context(
       const mstch::node& node,
-      const std::map<std::string, template_type>& partials);
+      const std::map<std::string, template_type>& partials,
+      const partial_callback partial_cb);
   const mstch::node& get_node(const std::string& token);
   std::string render(
       const template_type& templt, const std::string& prefix = "");
@@ -46,6 +47,7 @@ class render_context {
   std::deque<mstch::node> m_nodes;
   std::list<const mstch::node*> m_node_ptrs;
   std::stack<std::unique_ptr<render_state>> m_state;
+  partial_callback m_partial_cb;
 };
 
 }