diff --git a/include/libssh2.h b/include/libssh2.h
index edcdcf1e..53b343dd 100644
--- a/include/libssh2.h
+++ b/include/libssh2.h
@@ -545,7 +545,7 @@ LIBSSH2_API void libssh2_free(LIBSSH2_SESSION *session, void *ptr);
  *
  * Fills algs with a list of supported acryptographic algorithms. Returns a
  * non-negative number (number of supported algorithms) on success or a
- * negative number (an eror code) on failure.
+ * negative number (an error code) on failure.
  *
  * NOTE: on success, algs must be deallocated (by calling libssh2_free) when
  * not needed anymore
@@ -688,7 +688,7 @@ libssh2_userauth_publickey_frommemory(LIBSSH2_SESSION *session,
  * response_callback is provided with filled by library prompts array,
  * but client must allocate and fill individual responses. Responses
  * array is already allocated. Responses data will be freed by libssh2
- * after callback return, but before subsequent callback invokation.
+ * after callback return, but before subsequent callback invocation.
  */
 LIBSSH2_API int
 libssh2_userauth_keyboard_interactive_ex(LIBSSH2_SESSION* session,
@@ -718,7 +718,7 @@ LIBSSH2_API int libssh2_poll(LIBSSH2_POLLFD *fds, unsigned int nfds,
 
 #define SSH_EXTENDED_DATA_STDERR 1
 
-/* Returned by any function that would block during a read/write opperation */
+/* Returned by any function that would block during a read/write operation */
 #define LIBSSH2CHANNEL_EAGAIN LIBSSH2_ERROR_EAGAIN
 
 LIBSSH2_API LIBSSH2_CHANNEL *
@@ -1165,7 +1165,7 @@ libssh2_knownhost_writefile(LIBSSH2_KNOWNHOSTS *hosts,
  * libssh2_knownhost_get()
  *
  * Traverse the internal list of known hosts. Pass NULL to 'prev' to get
- * the first one. Or pass a poiner to the previously returned one to get the
+ * the first one. Or pass a pointer to the previously returned one to get the
  * next.
  *
  * Returns:
@@ -1221,7 +1221,7 @@ libssh2_agent_list_identities(LIBSSH2_AGENT *agent);
  * libssh2_agent_get_identity()
  *
  * Traverse the internal list of public keys. Pass NULL to 'prev' to get
- * the first one. Or pass a poiner to the previously returned one to get the
+ * the first one. Or pass a pointer to the previously returned one to get the
  * next.
  *
  * Returns:
diff --git a/include/libssh2_sftp.h b/include/libssh2_sftp.h
index 4a750b3e..b9932216 100644
--- a/include/libssh2_sftp.h
+++ b/include/libssh2_sftp.h
@@ -214,7 +214,7 @@ struct _LIBSSH2_SFTP_STATVFS {
 #define LIBSSH2_FX_INVALID_FILENAME         20
 #define LIBSSH2_FX_LINK_LOOP                21
 
-/* Returned by any function that would block during a read/write opperation */
+/* Returned by any function that would block during a read/write operation */
 #define LIBSSH2SFTP_EAGAIN LIBSSH2_ERROR_EAGAIN
 
 /* SFTP API */
diff --git a/src/bcrypt_pbkdf.c b/src/bcrypt_pbkdf.c
index e92969a0..f9a97580 100644
--- a/src/bcrypt_pbkdf.c
+++ b/src/bcrypt_pbkdf.c
@@ -36,7 +36,7 @@
  * function with the following modifications:
  * 1. The input password and salt are preprocessed with SHA512.
  * 2. The output length is expanded to 256 bits.
- * 3. Subsequently the magic string to be encrypted is lengthened and modifed
+ * 3. Subsequently the magic string to be encrypted is lengthened and modified
  *    to "OxychromaticBlowfishSwatDynamite"
  * 4. The hash function is defined to perform 64 rounds of initial state
  *    expansion. (More rounds are performed by iterating the hash.)
@@ -158,7 +158,7 @@ bcrypt_pbkdf(const char *pass, size_t passlen, const uint8_t *salt,
         }
 
         /*
-         * pbkdf2 deviation: ouput the key material non-linearly.
+         * pbkdf2 deviation: output the key material non-linearly.
          */
         amt = MINIMUM(amt, keylen);
         for(i = 0; i < amt; i++) {
diff --git a/src/mbedtls.c b/src/mbedtls.c
index 8bbcfd8d..128eee4b 100644
--- a/src/mbedtls.c
+++ b/src/mbedtls.c
@@ -272,7 +272,7 @@ _libssh2_mbedtls_bignum_random(_libssh2_bn *bn, int bits, int top, int bottom)
     if(err)
         return -1;
 
-    /* Zero unsued bits above the most significant bit*/
+    /* Zero unused bits above the most significant bit*/
     for(i = len*8 - 1; bits <= i; --i) {
         err = mbedtls_mpi_set_bit(bn, i, 0);
         if(err)
diff --git a/src/sftp.c b/src/sftp.c
index ece590e5..ac7ee016 100644
--- a/src/sftp.c
+++ b/src/sftp.c
@@ -1428,7 +1428,7 @@ static ssize_t sftp_read(LIBSSH2_SFTP_HANDLE * handle, char *buffer,
 
             /* 'count' is how much more data to ask for, and 'already' is how
                much data that already has been asked for but not yet returned.
-               Specificly, 'count' means how much data that have or will be
+               Specifically, 'count' means how much data that have or will be
                asked for by the nodes that are already added to the linked
                list. Some of those read requests may not actually have been
                sent off successfully yet.
diff --git a/tests/ssh2.c b/tests/ssh2.c
index d349ab90..7ef9f379 100644
--- a/tests/ssh2.c
+++ b/tests/ssh2.c
@@ -92,7 +92,7 @@ int main(int argc, char *argv[])
         return 1;
     }
 
-    /* At this point we havn't authenticated,
+    /* At this point we haven't authenticated,
      * The first thing to do is check the hostkey's fingerprint against our known hosts
      * Your app may have it hard coded, may go to a file, may present it to the user, that's your call
      */