diff --git a/parseclj-lex.el b/parseclj-lex.el
index 15794c2..42145b1 100644
--- a/parseclj-lex.el
+++ b/parseclj-lex.el
@@ -163,11 +163,20 @@ S goes through three transformations:
      ((eq first-char ?o) (string-to-number (substring c 2) 8))
      (t first-char))))
 
+(defun parseclj-lex--number-value (number-str)
+  "Parse the NUMBER-STR to an Elisp number."
+  (let ((ratio (split-string number-str "/")))
+    (if (= 2 (length ratio))
+        (let ((numerator (string-to-number (car ratio)))
+              (denominator (string-to-number (cadr ratio))))
+          (/ numerator (float denominator)))
+      (string-to-number number-str))))
+
 (defun parseclj-lex--leaf-token-value (token)
   "Parse the given leaf TOKEN to an Emacs Lisp value."
   (let ((token-type (parseclj-lex-token-type token)))
     (cond
-     ((eq :number token-type) (string-to-number (alist-get :form token)))
+     ((eq :number token-type) (parseclj-lex--number-value (alist-get :form token)))
      ((eq :nil token-type) nil)
      ((eq :true token-type) t)
      ((eq :false token-type) nil)
@@ -254,6 +263,11 @@ S goes through three transformations:
     (when (eq (char-after (point)) ?N)
       (right-char))
 
+    ;; clojure.lang.Ratio
+    (when (eq (char-after (point)) ?/)
+      (right-char)
+      (parseclj-lex-skip-number))
+
     (let ((char (char-after (point))))
       (if (and char (or (and (<= ?a char) (<= char ?z))
                         (and (<= ?A char) (<= char ?Z))
diff --git a/test/parseclj-lex-test.el b/test/parseclj-lex-test.el
index a541b4b..dbf71c3 100644
--- a/test/parseclj-lex-test.el
+++ b/test/parseclj-lex-test.el
@@ -66,6 +66,13 @@
                                          (:form . "0xff00AA")
                                          (:pos . 1)))))
 
+  (with-temp-buffer
+    (insert "12/34")
+    (goto-char 1)
+    (should (equal (parseclj-lex-next) '((:token-type . :number)
+                                         (:form . "12/34")
+                                         (:pos . 1)))))
+
   (with-temp-buffer
     (insert "#?(:clj 1 :cljs 2)")
     (goto-char 1)
diff --git a/test/parseclj-test-data.el b/test/parseclj-test-data.el
index 053fe12..6e6abe4 100644
--- a/test/parseclj-test-data.el
+++ b/test/parseclj-test-data.el
@@ -211,6 +211,18 @@
                               (:form . ":foo-bar")
                               (:value . :foo-bar))))))
 
+       "ratio"
+       (parseclj-alist
+        :tags '(:edn-roundtrip)
+        :source "12/34"
+        :edn '(0.35294117647058826)
+        :ast '((:node-type . :root)
+               (:position . 1)
+               (:children ((:node-type . :number)
+                           (:position . 1)
+                           (:form . "12/34")
+                           (:value . 0.35294117647058826)))))
+
        "vector"
        (parseclj-alist
         :tags '(:edn-roundtrip)
diff --git a/test/parseclj-unparse-test.el b/test/parseclj-unparse-test.el
index dbf3c79..5b984aa 100644
--- a/test/parseclj-unparse-test.el
+++ b/test/parseclj-unparse-test.el
@@ -130,6 +130,16 @@
                                    (:form . ":foo-bar")
                                    (:value . :foo-bar)))))))))
 
+(ert-deftest parseclj-unparse-clojure-ratio ()
+  (should (equal "12/34"
+                 (parseclj-unparse-clojure-to-string
+                  '((:node-type . :root)
+                    (:position . 1)
+                    (:children ((:node-type . :number)
+                                (:position . 1)
+                                (:form . "12/34")
+                                (:value . 0.35294117647058826))))))))
+
 (ert-deftest parseclj-unparse-clojure-vector ()
   (should (equal "[123]"
                  (parseclj-unparse-clojure-to-string