Ottadalen () is a valley in the municipalities of SkjÃÂ¥k, Lom, VÃÂ¥gÃÂ¥, and Sel in Innlandet county, Norway.
The Otta River flows through the valley. The Otta River begins in the municipality of SkjÃÂ¥k and flows into lake VÃÂ¥gÃÂ¥vatnet. Exiting VÃÂ¥gÃÂ¥vatnet at VÃÂ¥gÃÂ¥mo, it continues its journey through the valley, leaving the municipality of VÃÂ¥gÃÂ¥ to meet the GudbrandsdalslÃÂ¥gen river at the town of Otta in Sel Municipality.
Reinheimen National Park, which consists of much of the Tafjordfjella mountain range, includes the reindeer habitat in the northern part of the Ottadalen valley.