Yes, the Lactation Room is located in room 2D61 of Ellis Library. In order to get access to that room, you will need to request a key from the West Security Desk, and present your MU ID. 

The Lactation Room is available to Mizzou faculty, staff, and students. 

Amenities include a private room with a lockable door, table, chairs, electrical outlets, wastebasket, air/heat. 

Other Lactation Rooms on campus can be found here.