diff --git a/Cargo.toml b/Cargo.toml
index b266f0cc8..05a010044 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,6 +16,7 @@ unix = [
   "kill",
   "logname",
   "mkfifo",
+  "mktemp",
   "mv",
   "nice",
   "nohup",
@@ -118,6 +119,7 @@ link     = { optional=true, path="src/link" }
 ln       = { optional=true, path="src/ln" }
 logname  = { optional=true, path="src/logname" }
 mkdir    = { optional=true, path="src/mkdir" }
+mktemp   = { optional=true, path="src/mktemp" }
 mkfifo   = { optional=true, path="src/mkfifo" }
 mv       = { optional=true, path="src/mv" }
 nice     = { optional=true, path="src/nice" }
diff --git a/Makefile b/Makefile
index b648609d3..3c63d6176 100644
--- a/Makefile
+++ b/Makefile
@@ -59,6 +59,7 @@ PROGS       := \
   link \
   ln \
   mkdir \
+  mktemp \
   nl \
   nproc \
   od \
@@ -144,6 +145,7 @@ TEST_PROGS  := \
 	link \
 	ln \
 	mkdir \
+	mktemp \
 	mv \
 	nl \
 	paste \
diff --git a/README.md b/README.md
index 50abf4e2d..cfafcc8f6 100644
--- a/README.md
+++ b/README.md
@@ -165,7 +165,7 @@ To do
 - join
 - ls
 - mknod
-- mktemp
+- mktemp (almost done, some options are not working)
 - mv (almost done, one more option)
 - numfmt
 - od (in progress, needs lots of work)
diff --git a/src/mktemp/Cargo.toml b/src/mktemp/Cargo.toml
new file mode 100644
index 000000000..2545d17e9
--- /dev/null
+++ b/src/mktemp/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "mktemp"
+version = "0.0.1"
+authors = []
+
+[lib]
+name = "uu_mktemp"
+path = "mktemp.rs"
+
+[dependencies]
+uucore = { path="../uucore" }
+getopts = "*"
+libc = "*"
+rand = "0.3"
+tempfile = {git = "https://github.com/Stebalien/tempfile.git"}
diff --git a/src/mktemp/mktemp.rs b/src/mktemp/mktemp.rs
new file mode 100644
index 000000000..6e2cdfea4
--- /dev/null
+++ b/src/mktemp/mktemp.rs
@@ -0,0 +1,207 @@
+#![crate_name = "uu_mktemp"]
+
+/*
+ * This file is part of the uutils coreutils package.
+ *
+ * (c) Sunrin SHIMURA
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+extern crate getopts;
+extern crate libc;
+extern crate tempfile;
+extern crate rand;
+
+#[macro_use]
+extern crate uucore;
+
+use std::env;
+use std::io::Write;
+use std::path::{PathBuf, is_separator};
+use std::mem::forget;
+use std::iter;
+
+use rand::Rng;
+use tempfile::NamedTempFileOptions;
+
+static NAME: &'static str = "mktemp";
+static VERSION: &'static str = env!("CARGO_PKG_VERSION");
+static DEFAULT_TEMPLATE: &'static str = "tmp.XXXXXXXXXX";
+
+
+
+pub fn uumain(args: Vec<String>) -> i32 {
+    let mut opts = getopts::Options::new();
+    opts.optflag("d", "directory", "Make a directory instead of a file");
+    opts.optflag("u", "dry-run", "do not create anything; merely print a name (unsafe)");
+    opts.optflag("q", "quiet", "Fail silently if an error occurs.");
+    opts.optopt("", "suffix", "append SUFF to TEMPLATE; SUFF must not contain a path separator. This option is implied if TEMPLATE does not end with X.", "SUFF");
+    opts.optopt("p", "tmpdir", "interpret TEMPLATE relative to DIR; if DIR is not specified, use $TMPDIR if set, else /tmp.  With this option, TEMPLATE  must  not  be  an  absolute name; unlike with -t, TEMPLATE may contain slashes, but mktemp creates only the final component", "DIR");
+    // deprecated option of GNU coreutils
+    //    opts.optflag("t", "", "Generate a template (using the supplied prefix and TMPDIR if set) to create a filename template");
+    opts.optflag("", "help", "Print this help and exit");
+    opts.optflag("", "version", "print the version and exit");
+
+
+    // >> early return options
+    let matches = match opts.parse(&args[1..]) {
+        Ok(m) => m,
+        Err(f) => crash!(1, "Invalid options\n{}", f)
+    };
+
+    if matches.opt_present("quiet") {
+        // TODO: close stderror. `crash!` macro always write output to stderror
+        crash!(1, "quiet option is not supported yet.");
+    };
+
+    if  matches.opt_present("help") {
+        print_help(&opts);
+        return 0;
+    }
+    if matches.opt_present("version") {
+        println!("{} {}", NAME, VERSION);
+        return 0;
+    }
+
+    if 1 < matches.free.len() {
+        crash!(1, "Too many templates");
+    }
+    // <<
+
+    let make_dir = matches.opt_present("directory");
+    let dry_run = matches.opt_present("dry-run");
+    let suffix_opt = matches.opt_str("suffix");
+
+
+    let template = if matches.free.is_empty() {
+        DEFAULT_TEMPLATE
+    } else {
+        &matches.free[0][..]
+    };
+
+    let (prefix, rand, suffix) = match parse_template(template) {
+        Some((p, r, s)) => match suffix_opt {
+            Some(suf) => if s == "" {
+                (p, r, suf)
+            } else {
+                crash!(1, "Template should end with 'X' when you specify suffix option.")
+            },
+            None => (p, r, s.to_string())
+        },
+        None => ("",0, "".to_string())
+    };
+
+    if rand < 3 {
+        crash!(1, "Too few 'X's in template")
+    }
+
+    if suffix.chars().any(|c| is_separator(c)) {
+        crash!(1, "suffix cannot contain any path separators");
+    }
+
+
+    let tmpdir = match matches.opt_str("tmpdir") {
+        Some(s) => {
+            if PathBuf::from(prefix).is_absolute() {
+                crash!(1, "template must not be an absolute path when tempdir is specified.");
+            }
+            PathBuf::from(s)
+                
+        },
+        None => env::temp_dir()
+    };
+
+    if dry_run {
+        dry_exec(tmpdir, prefix, rand, &suffix)
+    } else {
+        exec(tmpdir, prefix, rand , &suffix, make_dir)
+    }
+
+}
+
+fn print_help(opts: &getopts::Options) {
+    let usage = format!(" Create a temporary file or directory, safely, and print its name.
+TEMPLATE must contain at least 3 consecutive 'X's in last component.
+If TEMPLATE is not specified, use {}, and --tmpdir is implied", DEFAULT_TEMPLATE);
+
+    println!("{} {}", NAME, VERSION);
+    println!("SYNOPSIS");
+    println!("  {} [OPTION]... [FILE]", NAME);
+    println!("Usage:");
+    print!("{}", opts.usage(&usage[..]));
+}
+
+fn parse_template(temp :&str) -> Option<(&str, usize, &str)> {
+    let right = match temp.rfind('X') {
+        Some(r) => r+1,
+        None => return None
+    };
+    let left = temp[..right].rfind(|c| c != 'X').map_or(0, |i| i + 1);
+    let prefix = &temp[..left];
+    let rand = right - left;
+    let suffix = &temp[right..];
+    Some((prefix, rand, suffix))
+}
+
+pub fn dry_exec(mut tmpdir: PathBuf, prefix: &str, rand: usize, suffix: &str) -> i32 {
+    let len = prefix.len() + suffix.len() + rand;
+    let mut buf = String::with_capacity(len);
+    buf.push_str(prefix);
+    buf.extend(iter::repeat('X').take(rand));
+    buf.push_str(suffix);
+
+    // Randomize.
+    unsafe {
+        // We guarantee utf8.
+        let bytes = &mut buf.as_mut_vec()[prefix.len()..prefix.len() + rand];
+        rand::thread_rng().fill_bytes(bytes);
+        for byte in bytes.iter_mut() {
+            *byte = match *byte % 62 {
+                v @ 0...9 => (v + '0' as u8),
+                v @ 10...35 => (v - 10 + 'a' as u8),
+                v @ 36...61 => (v - 36 + 'A' as u8),
+                _ => unreachable!(),
+            }
+        }
+    }
+    tmpdir.push(String::from(buf));
+    println!("{}", tmpdir.display());
+    return 0;
+}
+
+
+
+
+fn exec(tmpdir: PathBuf, prefix: &str, rand: usize, suffix: &str, make_dir: bool) -> i32 {
+    // TODO: respect make_dir option
+    if make_dir {
+        crash!(1, "Directory option is not supported yet. Sorry.");
+    }
+
+
+    let tmpfile = NamedTempFileOptions::new()
+        .prefix(prefix)
+        .rand_bytes(rand)
+        .suffix(suffix)
+        .create_in(tmpdir);
+
+    let tmpfile = match tmpfile {
+        Ok(f) => f,
+        Err(_) => crash!(1, "failed to create tempfile")
+    };
+    
+    let tmpname = tmpfile
+        .path()
+        .to_string_lossy()
+        .to_string();
+
+    println!("{}", tmpname);
+
+    // CAUTION: Not to call `drop` of tmpfile, which removes the tempfile,
+    // I call a dengeros function `forget`.
+    forget(tmpfile);
+
+    return 0;
+}
diff --git a/tests/mktemp.rs b/tests/mktemp.rs
new file mode 100644
index 000000000..31f38d941
--- /dev/null
+++ b/tests/mktemp.rs
@@ -0,0 +1,135 @@
+extern crate tempdir;
+
+use tempdir::TempDir;
+use std::env::set_var;
+
+#[macro_use]
+mod common;
+
+use common::util::*;
+
+static UTIL_NAME: &'static str = "mktemp";
+
+static TEST_TEMPLATE1: &'static str = "tempXXXXXX";
+static TEST_TEMPLATE2: &'static str = "temp";
+static TEST_TEMPLATE3: &'static str = "tempX";
+static TEST_TEMPLATE4: &'static str = "tempXX";
+static TEST_TEMPLATE5: &'static str = "tempXXX";
+static TEST_TEMPLATE6: &'static str = "tempXXXlate";
+static TEST_TEMPLATE7: &'static str = "XXXtemplate";
+#[cfg(unix)]
+static TEST_TEMPLATE8: &'static str = "tempXXXla/te";
+#[cfg(windows)]
+static TEST_TEMPLATE8: &'static str = "tempXXXla\\te";
+
+const TMPDIR: &'static str = "TMPDIR";
+
+
+#[test]
+fn test_mktemp_mktemp() {
+    let ts = TestSet::new(UTIL_NAME);
+
+    let pathname = ts.fixtures.as_string();
+
+    let exit_success1 = ts.util_cmd().env(TMPDIR, &pathname).arg(TEST_TEMPLATE1).run().success;
+    let exit_success2 = ts.util_cmd().env(TMPDIR, &pathname).arg(TEST_TEMPLATE2).run().success;
+    let exit_success3 = ts.util_cmd().env(TMPDIR, &pathname).arg(TEST_TEMPLATE3).run().success;
+    let exit_success4 = ts.util_cmd().env(TMPDIR, &pathname).arg(TEST_TEMPLATE4).run().success;
+    let exit_success5 = ts.util_cmd().env(TMPDIR, &pathname).arg(TEST_TEMPLATE5).run().success;
+    let exit_success6 = ts.util_cmd().env(TMPDIR, &pathname).arg(TEST_TEMPLATE6).run().success;
+    let exit_success7 = ts.util_cmd().env(TMPDIR, &pathname).arg(TEST_TEMPLATE7).run().success;
+    let exit_success8 = ts.util_cmd().env(TMPDIR, &pathname).arg(TEST_TEMPLATE8).run().success;
+
+
+    assert!(exit_success1);
+    assert!(!exit_success2);
+    assert!(!exit_success3);
+    assert!(!exit_success4);
+    assert!(exit_success5);
+    assert!(exit_success6);
+    assert!(exit_success7);
+    assert!(!exit_success8);
+}
+
+// TODO: test directory option when implemented
+
+#[test]
+fn test_mktemp_dry_run() {
+    let ts = TestSet::new(UTIL_NAME);
+
+    let pathname = ts.fixtures.as_string();
+
+    let exit_success1 = ts.util_cmd().env(TMPDIR, &pathname).arg("-u").arg(TEST_TEMPLATE1).run().success;
+    let exit_success2 = ts.util_cmd().env(TMPDIR, &pathname).arg("-u").arg(TEST_TEMPLATE2).run().success;
+    let exit_success3 = ts.util_cmd().env(TMPDIR, &pathname).arg("-u").arg(TEST_TEMPLATE3).run().success;
+    let exit_success4 = ts.util_cmd().env(TMPDIR, &pathname).arg("-u").arg(TEST_TEMPLATE4).run().success;
+    let exit_success5 = ts.util_cmd().env(TMPDIR, &pathname).arg("-u").arg(TEST_TEMPLATE5).run().success;
+    let exit_success6 = ts.util_cmd().env(TMPDIR, &pathname).arg("-u").arg(TEST_TEMPLATE6).run().success;
+    let exit_success7 = ts.util_cmd().env(TMPDIR, &pathname).arg("-u").arg(TEST_TEMPLATE7).run().success;
+    let exit_success8 = ts.util_cmd().env(TMPDIR, &pathname).arg("-u").arg(TEST_TEMPLATE8).run().success;
+
+
+    assert!(exit_success1);
+    assert!(!exit_success2);
+    assert!(!exit_success3);
+    assert!(!exit_success4);
+    assert!(exit_success5);
+    assert!(exit_success6);
+    assert!(exit_success7);
+    assert!(!exit_success8);
+}
+
+// TOOD: test quiet option when correctry implemented
+
+#[test]
+fn test_mktemp_suffix() {
+    let ts = TestSet::new(UTIL_NAME);
+
+    let pathname = ts.fixtures.as_string();
+
+    let exit_success1 = ts.util_cmd().env(TMPDIR, &pathname).arg("--suffix").arg("suf").arg(TEST_TEMPLATE1).run().success;
+    let exit_success2 = ts.util_cmd().env(TMPDIR, &pathname).arg("--suffix").arg("suf").arg(TEST_TEMPLATE2).run().success;
+    let exit_success3 = ts.util_cmd().env(TMPDIR, &pathname).arg("--suffix").arg("suf").arg(TEST_TEMPLATE3).run().success;
+    let exit_success4 = ts.util_cmd().env(TMPDIR, &pathname).arg("--suffix").arg("suf").arg(TEST_TEMPLATE4).run().success;
+    let exit_success5 = ts.util_cmd().env(TMPDIR, &pathname).arg("--suffix").arg("suf").arg(TEST_TEMPLATE5).run().success;
+    let exit_success6 = ts.util_cmd().env(TMPDIR, &pathname).arg("--suffix").arg("suf").arg(TEST_TEMPLATE6).run().success;
+    let exit_success7 = ts.util_cmd().env(TMPDIR, &pathname).arg("--suffix").arg("suf").arg(TEST_TEMPLATE7).run().success;
+    let exit_success8 = ts.util_cmd().env(TMPDIR, &pathname).arg("--suffix").arg("suf").arg(TEST_TEMPLATE8).run().success;
+
+
+    assert!(exit_success1);
+    assert!(!exit_success2);
+    assert!(!exit_success3);
+    assert!(!exit_success4);
+    assert!(exit_success5);
+    assert!(!exit_success6);
+    assert!(!exit_success7);
+    assert!(!exit_success8);
+}
+
+#[test]
+fn test_mktemp_tmpdir() {
+    let ts = TestSet::new(UTIL_NAME);
+
+   let path = TempDir::new_in(ts.fixtures.as_string(), UTIL_NAME).unwrap();
+   let pathname = path.path().as_os_str();
+
+    let exit_success1 = ts.util_cmd().arg("-p").arg(pathname).arg(TEST_TEMPLATE1).run().success;
+    let exit_success2 = ts.util_cmd().arg("-p").arg(pathname).arg(TEST_TEMPLATE2).run().success;
+    let exit_success3 = ts.util_cmd().arg("-p").arg(pathname).arg(TEST_TEMPLATE3).run().success;
+    let exit_success4 = ts.util_cmd().arg("-p").arg(pathname).arg(TEST_TEMPLATE4).run().success;
+    let exit_success5 = ts.util_cmd().arg("-p").arg(pathname).arg(TEST_TEMPLATE5).run().success;
+    let exit_success6 = ts.util_cmd().arg("-p").arg(pathname).arg(TEST_TEMPLATE6).run().success;
+    let exit_success7 = ts.util_cmd().arg("-p").arg(pathname).arg(TEST_TEMPLATE7).run().success;
+    let exit_success8 = ts.util_cmd().arg("-p").arg(pathname).arg(TEST_TEMPLATE8).run().success;
+
+
+    assert!(exit_success1);
+    assert!(!exit_success2);
+    assert!(!exit_success3);
+    assert!(!exit_success4);
+    assert!(exit_success5);
+    assert!(exit_success6);
+    assert!(exit_success7);
+    assert!(!exit_success8);
+}