Should I Hide My Savings and Investments From a Financially Irresponsible Spouse in Nigeria?

Yes but I would distinguish between protecting your finances and secretly hiding money.
If your spouse repeatedly spends irresponsibly, borrows money without agreement, or puts family finances at risk, it is reasonable to protect part of your savings and investments. However, completely concealing assets can create a serious trust problem if discovered. The safer goal is financial boundaries, not financial deception.
A safer approach
Have separate personal accounts
Maintain a joint account for agreed household expenses.
Each spouse can also have a personal account for personal savings.
Agree on how much each person contributes to the household.
Build an emergency reserve Keep an emergency fund that is not easily spent impulsively. Ideally, both spouses should know that the fund exists, even if only one person manages access to it.
Separate long-term investments from spending money Money intended for investments should not sit in the everyday spending account. You can use appropriate regulated investment platforms, treasury bills, mutual funds, pension investments, etc., depending on your goals.
Set a spending limit that requires agreement For example:
“Any expense above ₦100,000 should be discussed and agreed upon before we make the payment.”
The amount should be one that makes sense for your household.
Don’t give unrestricted access to everything If your spouse has demonstrated that they cannot control spending, you don’t have to put all your money in an account they can freely withdraw from. That’s a legitimate financial boundary.
Be transparent about the overall financial picture You can say:
“I want us to build wealth together, but I also need us to protect our future. I don’t want all our money available for immediate spending.”
You don’t necessarily have to disclose every password, PIN or security detail.
Consider a trusted financial structure For significant assets, professional advice from a qualified financial adviser or lawyer can help you structure ownership, beneficiaries and investments properly—particularly where there are substantial assets.