diff --git a/src/agent.c b/src/agent.c
index a8a5025..50e999a 100644
--- a/src/agent.c
+++ b/src/agent.c
@@ -699,7 +699,7 @@ 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/src/channel.c b/src/channel.c
index 9979522..76ed9bf 100644
--- a/src/channel.c
+++ b/src/channel.c
@@ -451,7 +451,7 @@ channel_forward_listen(LIBSSH2_SESSION * session, const char *host,
             LIBSSH2_ALLOC(session, session->fwdLstn_packet_len);
         if (!session->fwdLstn_packet) {
             _libssh2_error(session, LIBSSH2_ERROR_ALLOC,
-                           "Unable to allocate memeory for setenv packet");
+                           "Unable to allocate memory for setenv packet");
             return NULL;
         }
 
@@ -616,7 +616,7 @@ int _libssh2_channel_forward_cancel(LIBSSH2_LISTENER *listener)
         s = packet = LIBSSH2_ALLOC(session, packet_len);
         if (!packet) {
             _libssh2_error(session, LIBSSH2_ERROR_ALLOC,
-                           "Unable to allocate memeory for setenv packet");
+                           "Unable to allocate memory for setenv packet");
             return LIBSSH2_ERROR_ALLOC;
         }
 
@@ -788,7 +788,7 @@ static int channel_setenv(LIBSSH2_CHANNEL *channel,
             LIBSSH2_ALLOC(session, channel->setenv_packet_len);
         if (!channel->setenv_packet) {
             return _libssh2_error(session, LIBSSH2_ERROR_ALLOC,
-                                  "Unable to allocate memeory "
+                                  "Unable to allocate memory "
                                   "for setenv packet");
         }
 
@@ -2574,7 +2574,7 @@ libssh2_channel_window_read_ex(LIBSSH2_CHANNEL *channel,
  * libssh2_channel_window_write_ex
  *
  * Check the status of the write window Returns the number of bytes which may
- * be safely writen on the channel without blocking window_size_initial (if
+ * be safely written on the channel without blocking window_size_initial (if
  * passed) will be populated with the size of the initial window as defined by
  * the channel_open request
  */
diff --git a/src/comp.c b/src/comp.c
index 79b8ee2..eeb89b4 100644
--- a/src/comp.c
+++ b/src/comp.c
@@ -230,7 +230,7 @@ comp_method_zlib_decomp(LIBSSH2_SESSION * session,
     /* If strm is null, then we have not yet been initialized. */
     if (strm == NULL)
         return _libssh2_error(session, LIBSSH2_ERROR_COMPRESS,
-                              "decompression unitilized");;
+                              "decompression uninitialized");;
 
     /* In practice they never come smaller than this */
     if (out_maxlen < 25)
diff --git a/src/scp.c b/src/scp.c
index 63d181e..1ccd3be 100644
--- a/src/scp.c
+++ b/src/scp.c
@@ -133,7 +133,7 @@ shell_quotearg(const char *path, unsigned char *buf,
      * Processing States:
      *  UQSTRING:       unquoted string: ... -- used for quoting exclamation
      *                  marks. This is the initial state
-     *  SQSTRING:       single-qouted-string: '... -- any character may follow
+     *  SQSTRING:       single-quoted-string: '... -- any character may follow
      *  QSTRING:        quoted string: "... -- only apostrophes may follow
      */
     enum { UQSTRING, SQSTRING, QSTRING } state = UQSTRING;
diff --git a/src/session.c b/src/session.c
index cbdf980..6549e7a 100644
--- a/src/session.c
+++ b/src/session.c
@@ -686,7 +686,7 @@ session_startup(LIBSSH2_SESSION *session, libssh2_socket_t sock)
             !get_socket_nonblocking(session->socket_fd);
 
         if (session->socket_prev_blockstate) {
-            /* If in blocking state chang to non-blocking */
+            /* If in blocking state change to non-blocking */
             session_nonblock(session->socket_fd, 1);
         }
 
@@ -1522,7 +1522,7 @@ libssh2_poll(LIBSSH2_POLLFD * fds, unsigned int nfds, long timeout)
     }
 #else
     /* No select() or poll()
-     * no sockets sturcture to setup
+     * no sockets structure to setup
      */
 
     timeout = 0;
diff --git a/src/sftp.c b/src/sftp.c
index a0892f3..97105a3 100644
--- a/src/sftp.c
+++ b/src/sftp.c
@@ -535,7 +535,7 @@ sftp_packet_require(LIBSSH2_SFTP *sftp, unsigned char packet_type,
 }
 
 /* sftp_packet_requirev
- * Require one of N possible reponses
+ * Require one of N possible responses
  */
 static int
 sftp_packet_requirev(LIBSSH2_SFTP *sftp, int num_valid_responses,
@@ -721,7 +721,7 @@ static LIBSSH2_SFTP *sftp_init(LIBSSH2_SESSION *session)
          *
          * Note that you MUST NOT try to call libssh2_sftp_init() again to get
          * another handle until the previous call has finished and either
-         * succesffully made a handle or failed and returned error (not
+         * successfully made a handle or failed and returned error (not
          * including *EAGAIN).
          */
 
@@ -858,7 +858,7 @@ static LIBSSH2_SFTP *sftp_init(LIBSSH2_SESSION *session)
         sftp_handle->version = LIBSSH2_SFTP_VERSION;
     }
     _libssh2_debug(session, LIBSSH2_TRACE_SFTP,
-                   "Enabling SFTP version %lu compatability",
+                   "Enabling SFTP version %lu compatibility",
                    sftp_handle->version);
     while (s < (data + data_len)) {
         size_t extname_len, extdata_len;
@@ -929,7 +929,7 @@ LIBSSH2_API LIBSSH2_SFTP *libssh2_sftp_init(LIBSSH2_SESSION *session)
 /*
  * sftp_shutdown
  *
- * Shutsdown the SFTP subsystem
+ * Shuts down the SFTP subsystem
  */
 static int
 sftp_shutdown(LIBSSH2_SFTP *sftp)
@@ -1960,7 +1960,7 @@ static ssize_t sftp_write(LIBSSH2_SFTP_HANDLE *handle, const char *buffer,
                 /* flush all pending packets from the outgoing list */
                 sftp_packetlist_flush(handle);
 
-                /* since we return error now, the applicaton will not get any
+                /* since we return error now, the application will not get any
                    outstanding data acked, so we need to rewind the offset to
                    where the application knows it has reached with acked data */
                 handle->u.file.offset -= handle->u.file.acked;
diff --git a/src/transport.c b/src/transport.c
index 3cbd170..3d61f8d 100644
--- a/src/transport.c
+++ b/src/transport.c
@@ -536,7 +536,7 @@ int _libssh2_transport_read(LIBSSH2_SESSION * session)
             p->readidx += numdecrypt;
             /* advance write pointer */
             p->wptr += numdecrypt;
-            /* increse data_num */
+            /* increase data_num */
             p->data_num += numdecrypt;
 
             /* bytes left to take care of without decryption */
@@ -552,7 +552,7 @@ int _libssh2_transport_read(LIBSSH2_SESSION * session)
             p->readidx += numbytes;
             /* advance write pointer */
             p->wptr += numbytes;
-            /* increse data_num */
+            /* increase data_num */
             p->data_num += numbytes;
         }
 
diff --git a/src/userauth.c b/src/userauth.c
index 2db5be4..e71c35a 100644
--- a/src/userauth.c
+++ b/src/userauth.c
@@ -211,7 +211,7 @@ userauth_password(LIBSSH2_SESSION *session,
                sizeof(session->userauth_pswd_packet_requirev_state));
 
         /*
-         * 40 = acket_type(1) + username_len(4) + service_len(4) +
+         * 40 = packet_type(1) + username_len(4) + service_len(4) +
          * service(14)"ssh-connection" + method_len(4) + method(8)"password" +
          * chgpwdbool(1) + password_len(4) */
         session->userauth_pswd_data_len = username_len + 40;