Maria Rachel "Baby" Jimenez Arenas is a Filipina businesswoman and politician currently serving as the House of Representatives of the Philippines from 2007 to 2013 and again since 2022.

Her maternal grandparents were Alfredo Jimenez, an accountant at the Bureau of Internal Revenue (BIR); and Remedios Bosch, an opera singer and a music professor at the University of the East (UE).

She graduated from the De La Salle University with a degree in AB Political Science earning an Academic Excellence Award for Outstanding Thesis.

She also oversaw the rehabilitation of river banks, construction of proper drainage systems, and clearing waterways to alleviate the District's long-time flooding problem.

[7] Arenas also authored and sponsored national bills that called for social justice, empowerment of the marginalized, and the improvement of basic services, such as health, education and livelihood.

In line with combating corruption in President Benigno Aquino’s “Daang Matuwid” she authored HB 2471 seeking the protection, security and benefits of whistleblowers.