The Lakeside Wheelers Mullingar will be hosting the championships.
A Westmeath Cycling Club are hosting the National Time Trial Championships in Kilbeggan.
Lakeside Wheelers Mullingar will be staging the event for the second time and first since 2014.
74 riders are signed on for the National TT Race which is the largest number ever recorded by Irish Cycling.
The event will run from today until Sunday.
Lifetime club member Caoimhe O'Brien will be involved in the ladies race, with 2014 men's champion Ryan Mullen set to feature having just raced the Giro d'Italia.
The Paracycling National Championships will also be on show to decide the national champions in various paracycling categories.
Race Director with Lakeside Wheelers Shay O'Toole praised the efforts of the club in putting everything together:
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