Worshipful Master 
The senior officer of a Masonic Lodge (also known as a Blue Lodge) is the Master, normally addressed and referred to as "Worshipful Master". The Worshipful Master sits in the East of the Lodge room, directs all of the business of his Lodge, and presides over ritual and ceremonies. The office of Worshipful Master is the highest honor to which a Lodge may elect or appoint any of its members. He is normally addressed as "Worshipful Brother" (WB) or "Worshipful" (Wor.) outside Lodge proceedings. At the conclusion of his first term, a Worshipful Master becomes known as a Past Master (PM). The duties and privileges of Past Masters vary from Lodge to Lodge. A Past Master is also addressed as "Worshipful Brother" or "Worshipful".  It should be noted that the honorific title of Worshipful does not imply that the Master is worshiped. Rather, use of the word implies its original meaning, "to give respect", similar to calling a judge "Your Honor" or a mayor "Honorable".

Senior Warden 
The Senior Warden, sitting in the West, is the second of the three principal officers of a Lodge, and is the Master's principal deputy. If the Worshipful Master is ever absent, then the Senior Warden presides as "acting Master" in all matters of Lodge business.

Junior Warden
The third of the principal officers is the Junior Warden, sitting in the South. The Junior Warden is charged with the supervision of the Lodge while it is in recess for meals, refreshment or other social purposes. The Junior Warden presides if both the Worshipful Master and Senior Warden are absent, a most rare occurrence.

Treasurer 
The Treasurer is tasked to keep the financial accounts, make all deposits of monies and pay approved bills. The annual presentation of accounts, or audit, is an important measure of the Lodge's continuing viability, and his accuracy in maintaining financial records is essential. 
 
Secretary 
The Secretary's official duties include issuing or authorizing publication of a summons (a formal notice of an impending meeting) as directed by the Worshipful Master, recording meeting minutes, submitting bills, receives all monies due to the Lodge from all sources and hands them over to the Treasurer, completing statistical reports to the Grand Lodge, and maintain all Lodge correspondence and records. His records are also subject to audit. He advises the Worshipful Master on matters of Lodge procedure, following the Lodge By-Laws and the Ahiman Rezon. 

Senior Deacon
The Senior Deacon is the principal assistant of the Worshipful Master. The Senior Deacon is tasked to welcome visiting Brothers into the Lodge. It is his duty to carry orders between the Worshipful Master and the Senior Warden and is intimately involved in degree work as well as the opening and closing of the Lodge. 

Junior Deacon
The Junior Deacon is tasked to assist the Senior Warden by carrying messages from the Senior Warden in the West to the Junior Warden in the South and to guard the outer door of the Lodge. It is his duty to ascertain at all times whether the Tiler is guarding the outer door; only allowing Brothers to enter after they have been properly vouched for. The Junior Deacon and the Tiler communicate frequently in this regard as well as during the opening and closing of the Lodge.
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Senior and Junior Stewards 
The two Stewards fulfill a number of junior assistant roles. The Steward positions are excellent opportunities for a Brother to begin their leadership career in a Blue Lodge. The Brother designated as the Senior Steward usually will have some speaking roles. Some common duties include the following: Stewards are often tasked with an understudy role to fill the position of the Senior Deacon or Junior Deacon. When a degree ceremony is performed, one or more Steward(s) may be required to assist the Lodge officers. Stewards have a traditional role of management of meals and refreshments as directed by the Junior Warden. 
 
Tiler  
The Tiler is to guard the outer door and ensure that Lodge and visiting Brothers are in possession of the necessary credentials before they are allowed to enter. He symbolically guards the door to the Lodge room with a sword. The Tiler is tasked to challenge all who desire to enter the Lodge and ascertain if they are to be allowed entry.  "Tyler" is a
sometimes used alternate spelling.