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1st Ohio General Assembly
2nd →
Ohio's first statehouse at Chillicothe (1800)
Overview
Term	March 1, 1803 (1803-03-01) – December 4, 1803 (1803-12-04)
Ohio Senate
Members	14
President of the Senate	Nathaniel Massie (D-R)
Party control	Democratic-Republican Party
House of Representatives
Members	30
House Speaker	Michael Baldwin (D-R)
Party control	Democratic-Republican Party
Sessions
1st March 1, 1803 – April 16, 1803

The First Ohio General Assembly was the initial meeting of the Ohio state legislature, composed of the Ohio State Senate and the Ohio House of Representatives. It convened in Chillicothe, Ohio, on March 1, 1803, and adjourned April 16, 1803.^[1] This General Assembly coincided with the first year of Edward Tiffin's first term as Ohio Governor.

Under Ohio's first constitution, State Senators were elected to two year terms. For the first class, half were elected for one year and half for two years. Members of the House were elected for each term. The Constitution was written in November, 1802, and submitted to the U S Congress. Elections for the first session were held in January, 1803. The apportionment of legislative districts was based on the 1802 Ohio Constitution, in section 7 of the Schedule.^[1] Subsequent sessions would be elected each October, and meet the first Monday of December.

For the first session, the constitution apportioned four senators for Hamilton County, one senator for Clermont County, one senator for Adams County, two senators for Ross County, one senator for Fairfield County, two senators for Washington County, one senator for Belmont County, two senators for Jefferson County, and one senator for Trumbull County.^[1]

For the first session, the constitution apportioned eight representatives for Hamilton County, two representatives for Clermont County, three representatives for Adams County, four representatives for Ross County, two representatives for Fairfield County, three representatives for Washington County, two representatives for Belmont County, four representatives for Jefferson County, and two representatives for Trumbull County.^[1]

In joint session, state officers were elected: William Creighton Jr. as Ohio Secretary of State, William McFarland as Ohio State Treasurer and Thomas Gibson as Ohio State Auditor.^[6]

John Smith and Thomas Worthington were elected United States Senators, with no record of vote made.^[6]

In joint session, local judges and three Ohio Supreme Court judges, Return Jonathan Meigs Jr., Samuel Huntington, and William Sprigg, were elected.^[7]

Eight new counties were erected during this session:^[7]

• Butler detached from Hamilton
• Columbiana erected from parts of Jefferson and Washington
• Franklin detached from Ross
• Gallia from Ross
• Greene from parts of Hamilton and Ross
• Montgomery from Hamilton
• Scioto from Adams
• Warren from Hamilton

Existing territorial laws were recognized as in force, if not specifically invalidated.

• List of Ohio state legislatures

• Gilkey, Elliot Howard, ed. (1901). The Ohio Hundred Year Book: a Hand-book of the Public Men and Public Institutions of Ohio ... State of Ohio.
• Taylor, William Alexander; Taylor, Aubrey Clarence (1899). Ohio statesmen and annals of progress: from the year 1788 to the year 1900 ... State of Ohio.

• "Alphabetical list of Members of the General Assembly of Ohio for 127 years - 1803 - 1930". State Library of Ohio. Archived from the original on 2012-04-15.