The rank above colonel is called brigadier, brigade general or brigadier general.
In the Israel Defense Forces, the rank of brigadier general is called Tat Aluf and is the third highest rank, below Aluf (major general) and Rav Aluf (lieutenant general or general), and above Aluf Mishne (colonel). The equivalent rank for Brigadier General in Iranian army and air force is called Sar-Tip. It is above the rank of Sar-Hang (colonel) and below the rank of Sar-Lashkar (major general). Notice that Iranian Revolutionary Guards also use this rank. The difference is in salutation. The United States rank of colonel is a direct successor to the same rank in the British Army. The first colonels in America were appointed from Colonial militias maintained as reserves to the British Army in the American colonies. The first insignia for the rank of colonel consisted of gold epaulettes worn on the blue uniform of the Continental Army. The first recorded use of the eagle insignia was in 1805 as this insignia was made official in uniform regulations by 1810. Colonel (abbreviated Col. , Col or COL and pronounced /ˈkɜrnəl/ , similar to kernel) is a senior military officer rank below the general officer ranks. However, in some small military forces, such as those of Iceland or the Vatican, colonel is the highest rank. The title Colonel of the Regiment (to distinguish it from the military rank of colonel) continues to be used in the modern British Army. The ceremonial position is often conferred on retired general officers, brigadiers or colonels who have a close link to a particular regiment. Brigadier General is a senior rank in the Armed Forces. It is the lowest ranking General Officer in some countries, usually sitting between the ranks of Colonel and Major General. A Brigadier General is typically in command of a Brigade consisting of around 3,000 troops (three Battalions). The equivalent rank for Brigadier General in Iranian army and air force is called Sar-Tip. It is above the rank of Sar-Hang (colonel) and below the rank of Sar-Lashkar (major general). Notice that Iranian Revolutionary Guards also use this rank. The difference is in salutation. It is the lowest ranking General Officer between the ranks of Colonel and Major General. The Bangladesh Army introduced the rank of Brigadier General in 2001, however the grade stayed equivalent to Brigadier. Brigadier General is equivalent to Commodore of Bangladesh Navy & Air Commodore of Bangladesh Air Force. The equivalent rank for Brigadier General in Iranian army and air force is called Sar-Tip. It is above the rank of Sar-Hang (colonel) and below the rank of Sar-Lashkar (major general). Notice that Iranian Revolutionary Guards also use this rank. The difference is in salutation. The rank of colonel is typically above the rank of lieutenant colonel. The rank above colonel is typically called brigadier, brigade general or brigadier general. Equivalent naval ranks may be called captain or ship-of-the-line captain. In the Commonwealth air force rank system, the equivalent rank is group captain. The title Colonel of the Regiment (to distinguish it from the military rank of colonel) continues to be used in the modern British Army. The ceremonial position is often conferred on retired general officers, brigadiers or colonels who have a close link to a particular regiment. Style and method of wear may vary between the services. In the United States Army, Air Force, and Marine Corps, colonel (pronounced ker-nul) is the most senior field grade military officer rank immediately above the rank of lieutenant colonel and immediately below the rank of brigadier general. The first insignia for the rank of colonel consisted of gold epaulettes worn on the blue uniform of the Continental Army. The first recorded use of the eagle insignia was in 1805 as this insignia was made official in uniform regulations by 1810. The insignia of the rank of colonel, as seen on the right, is worn on the officer's left side (a mirror-image version is worn on the right side, such that the eagle always faces forward to the wearer's front; the left-side version is also worn centered on fatigue caps, helmets, ACU & ECWCS breasts, inter alia). The first insignia for the rank of colonel consisted of gold epaulettes worn on the blue uniform of the Continental Army. The first recorded use of the eagle insignia was in 1805 as this insignia was made official in uniform regulations by 1810. The exception to this is during wartime, when a captain or major might be promoted sooner than normal due to exceptional service or an immediate vacancy in the ranks. Lieutenant colonels are immediately above the rank of major and below the rank of colonel. Lieutenant colonels will usually have a major or captain as their executive officers, with a command sergeant major serving as chief non-commissioned officer. 
http://military.wikia.com/wiki/Brigadier_General https://en.wikipedia.org/wiki/Colonel_(United_States) https://en.wikipedia.org/wiki/Colonel http://military.wikia.com/wiki/Brigadier_General http://military.wikia.com/wiki/Brigadier_General https://en.wikipedia.org/wiki/Colonel https://en.wikipedia.org/wiki/Colonel_(United_States) https://en.wikipedia.org/wiki/Colonel_(United_States) http://work.chron.com/rank-commander-army-18544.html
what rank is above a colonel